The world’s first underground railway, origins, rolling stock, identity, stations, and legacy
AT A GLANCE
| Opened | 10th January 1863 |
| Original Operator | Metropolitan Railway |
| Current Operator | Transport for London (TfL) |
| Line Colour | Magenta (Pantone 235 C) |
| Length | 67 km (41 miles) — longest line on the Underground |
| Stations | 34 (current) |
| Termini | Aldgate (east) / Amersham & Chesham / Watford (west/northwest) |
| Current Stock | S8 Stock (introduced 2010–2012) |
| Zone Range | Zones 1–6 (Amersham in zone 9 for fares) |
SECTION ONE
Origins and Ownership: The Metropolitan Railway
The Metropolitan Line holds a distinction that no other railway in the world can claim: it was the first underground urban railway ever built. On 10 January 1863, steam-hauled trains began running beneath the streets of London between Paddington (then called Bishop’s Road) and Farringdon Street, a distance of just under four miles, and the age of the underground railway began. The man most responsible for bringing this about was Charles Pearson, a solicitor and former City of London MP, who had championed the idea of a subterranean railway through the city for nearly two decades before he lived to see it realised, though he died just months before the opening, in September 1862, never riding the railway he had done so much to create.
The company that built and operated the line was the Metropolitan Railway, incorporated by an Act of Parliament in 1854 and funded by a combination of the Great Western Railway, the City of London, and private shareholders. John Fowler, the engineer who designed the line, solved the most fundamental problem,3 how to ventilate a steam railway running through underground tunnels, with a method that sounds improbable in retrospect: the tunnels were built as brick-lined open cuttings wherever possible, covered over with iron and masonry. Stations were provided with ventilation shafts. Steam locomotives were fitted with condensing apparatus to reduce exhaust emissions. None of these measures was fully successful. Early accounts of travel on the Metropolitan Railway are peppered with references to sulphurous fumes, billowing smoke, and passengers who emerged from the tunnels coughing and red-eyed.
Despite its atmospheric deficiencies, the Metropolitan Railway was an immediate commercial success. On its opening day, approximately 30,000 passengers made the journey, and the line carried nearly ten million passengers in its first year of operation. The promoters had correctly identified that London’s surface streets were chronically overcrowded and that there was enormous pent-up demand for a faster, more reliable means of traversing the city. The underground railway, for all its imperfections, provided it.
The Metropolitan Railway was the most improbable piece of Victorian infrastructure: a steam railway buried beneath the world’s greatest city. It worked almost immediately.
Expansion Under Sir Edward Watkin
The Metropolitan Railway’s most expansionist phase came under the chairmanship of Sir Edward Watkin, who took control of the company in 1872 and pursued an extraordinary vision: a metropolitan railway that would extend far beyond London into the Buckinghamshire countryside, eventually connecting, via a proposed Channel Tunnel, to the European mainland. Watkin was simultaneously chairman of the Manchester, Sheffield and Lincolnshire Railway and the South Eastern Railway, and he envisaged the Metropolitan as the London link in a continuous Anglo-European rail corridor.
The Channel Tunnel element of this vision never materialised, but the extension of the Metropolitan into Middlesex, Hertfordshire, and Buckinghamshire did. Between the 1880s and 1892, the line was extended through Harrow, Rickmansworth, Chorleywood, and Chesham, reaching Aylesbury by 1892. These extensions transformed the Metropolitan from a city-centre commuter line into something approaching a rural railway, running through open farmland and small market towns that would, in the following decades, be transformed by the very service that now connected them to London.
Metro-land and the Making of the Suburbs
The phenomenon that grew from the Metropolitan’s rural extensions became one of the defining stories of early twentieth-century Britain: Metro-land. The term was coined by the Metropolitan Railway’s publicity department, which from 1915 onwards produced a series of annual guidebooks promoting the villages, hills, and golf courses of the Chilterns as an accessible rural idyll for the London professional classes. The guidebooks were beautifully produced, written with something close to genuine affection for the countryside they described, and enormously effective. Developers followed the railway into the fields, and the semi-detached suburbs that grew up between the wars along the Metropolitan’s outer branches, Wembley, Harrow, Pinner, Northwood, Chorleywood, became the archetype of middle-class suburban England.
John Betjeman’s 1973 BBC documentary ‘Metro-land’, written and presented by the poet laureate himself, immortalised both the phenomenon and the railway that created it. Betjeman’s affectionate, elegiac account of the suburbs stretching out from Baker Street into the Buckinghamshire hills captured something true about the Metropolitan’s unique character: unlike the deep-tube lines of central London, the Met ran through a landscape it had itself largely created.
Absorption into London Transport
The Metropolitan Railway maintained its independent existence longer than any other London underground company. When the London Passenger Transport Board was created in 1933, absorbing the various underground and bus companies into a unified public body, the Metropolitan was the last and most reluctant recruit. Its management had long resisted incorporation, preferring its status as a mainline railway operator to the more municipal identity of the underground companies. The LPTB absorbed it nonetheless, and in 1933 the Metropolitan Railway ceased to exist as a legal entity, its assets, rolling stock, and staff passing to the new Board.
The line passed through further organisational changes as London’s transport was nationalised, denationalised, and reorganised across the following decades, from the LPTB to the London Transport Executive, to London Transport, and finally, following the creation of Transport for London under the Greater London Authority Act 1999, to TfL, which operates the line today.
SECTION TWO
Rolling Stock: From Steam to S8
The Metropolitan Line has been served by a greater variety of rolling stock than almost any other line on the Underground, reflecting a history that stretches from the Victorian steam age through the Edwardian era of electric traction to the modern air-conditioned aluminium trains of the 2010s. Each generation of stock tells a story about the technology, economics, and aesthetic ambitions of its time.
Steam Traction (1863–1905)
The original Metropolitan Railway was worked by steam locomotives from its opening in 1863 until electrification in 1905. The Great Western Railway initially provided locomotives and rolling stock under a working agreement, but the Metropolitan soon acquired its own engines. The locomotives that worked the line in its early years were specially designed ‘condensing’ engines, built to collect their own exhaust steam in tanks rather than releasing it into the tunnels. In practice the condensing apparatus was only partially effective, and the underground sections of the Metropolitan were notoriously smoky.
The passenger carriages of the early Metropolitan were four-wheeled vehicles with gas lighting and minimal amenity, reflecting the standards of Victorian second- and third-class rail travel. First-class accommodation was more comfortable, with padded seating and individual compartments. As the railway extended into the countryside in the 1880s and 1890s, the carriages became more sophisticated, with bogie vehicles offering a smoother ride on the longer outer sections of the route.
Electrification and the Dreadnought Stock (1905–1961)
The Metropolitan was electrified on a 600-volt direct current system from 1905, initially using a four-rail arrangement (later standardised across the Underground). Electric multiple unit trains replaced steam traction on the inner sections of the route, though steam locomotives continued to work freight trains and some passenger services on the outer sections to Aylesbury until 1961, an extraordinary survival that meant the Metropolitan was running steam-hauled passenger trains more than half a century after it had introduced electric traction.
The most celebrated rolling stock of the Metropolitan Railway era was the so-called ‘Dreadnought’ stock, a series of large bogie coaches introduced from 1910 onwards for the outer suburban services. The Dreadnoughts were among the most luxurious carriages ever operated on what was nominally an underground railway, with first-class saloons fitted with upholstered seating, polished wood panelling, and later, in a refinement almost without parallel on a metropolitan transit system, a dining car service. The Pullman buffet cars that operated on the Aylesbury and Verney Junction services in the 1890s and early 1900s allowed passengers to take a meal in comfortable surroundings as they travelled between Baker Street and the Buckinghamshire countryside.
The Standard and T Stock Era (1920s–1960s)
Through the 1920s and 1930s, the Metropolitan operated a mix of electric multiple units that were gradually standardised across the London Passenger Transport Board’s fleet. The ‘T Stock’, introduced in 1927, was designed specifically for the Metropolitan’s surface-level outer sections, with wider, more comfortable saloons than the tube stock used on the deep-level lines. The T Stock remained in service on the Metropolitan until 1962, providing an important link between the railway’s Edwardian character and the post-war modernisation of London Transport.
A, C, and D Stock (1960s–2012)
The modernisation of London Transport’s surface stock in the 1960s and 1970s brought new generations of rolling stock to the Metropolitan. The A60 and A62 Stock, introduced from 1960 onwards for the Amersham and Watford services, were clean-lined aluminium-bodied units that represented a decisive break with the Edwardian tradition. Their livery, unpainted aluminium with red and grey stripes, reflected the corporate design philosophy that London Transport’s design office had maintained since the 1930s.
The A Stock, as the A60 and A62 series were collectively known, served the Metropolitan for over fifty years, an extraordinarily long service life that reflected both the quality of their original construction and the financial constraints on rolling stock replacement. By the time the last A Stock units were withdrawn from service in 2012, they had become the oldest trains in regular service on the London Underground, beloved by enthusiasts for their distinctive acceleration sound and their sliding door mechanisms, and regarded by everyday commuters with a mixture of affection and exasperation.
S8 Stock (2010–Present)
The S Stock — or ‘Surface Stock’, was introduced on the Metropolitan from 2010 as part of a major programme to replace the ageing A, C, and D Stocks across all four sub-surface lines. The S8 variant (eight cars per train) operates on the Metropolitan, while the shorter S7 version serves the Circle, District, and Hammersmith & City lines. Manufactured by Bombardier Transportation at their Derby plant, the S Stock trains represent a significant improvement in passenger amenity: they are air-conditioned (a novelty for the underground when introduced), have walk-through interiors without inter-car barriers, are fully accessible, and offer real-time information displays throughout.
The S8 trains are finished in a silver livery with coloured doors, magenta on the Metropolitan, matching the line’s official colour. Their introduction also brought the end of the slam-door tradition on the surface lines: automatic doors, already standard on tube stock, now operate throughout the network.
SECTION THREE
The Colour: Magenta and Its Meaning
On the standard TfL Tube map, the Metropolitan Line is represented in a rich magenta — officially Pantone 235 C, a deep, warm pink-purple that sits unmistakably in the upper-left arc of the diagram, stretching from Aldgate through Baker Street and out to Amersham, Chesham, and Watford. It is one of the most immediately recognisable colours on the map, and one of the oldest.
The system of colour-coding London’s underground lines developed gradually across the early twentieth century, rather than emerging from a single design decision. The Metropolitan Railway used magenta, or a colour broadly described as crimson or dark red in contemporary documents, on early printed maps and timetables as a means of distinguishing its services from those of other companies. When the first diagrammatic maps of the combined Underground network appeared in the 1920s and, definitively, in Harry Beck’s 1933 diagram, the Metropolitan was assigned a dark red-purple that occupied a distinct position in the colour spectrum between the true red of the Central line and the brown of the Bakerloo.
The precise shade has been refined and standardised over the decades. The current Pantone 235 C specification, a vivid, slightly warm magenta, dates from TfL’s comprehensive corporate identity work of the late twentieth and early twenty-first centuries. The choice of magenta for the Metropolitan carries a certain historical logic: the line is old, distinguished, and somewhat aristocratic in character, running through some of London’s most prosperous outer suburbs, and the deep, rich colour suits its status as the ‘senior’ line on the network.
Magenta was not chosen for the Metropolitan Line by a design committee. It was earned, over 160 years, by the oldest underground railway in the world.
The Metropolitan’s colour also carries a practical function that Beck identified as essential: it must be instantly distinguishable from all neighbouring colours on the map. Surrounded by the yellow of the Circle line, the pink of the Hammersmith & City, and the dark blue of the Piccadilly, the Metropolitan’s magenta holds its territory with confidence. Colour-blind passengers, for whom the original Beck map posed significant challenges, are better served by the current palette, which TfL has worked to optimise for the most common forms of colour vision deficiency, though some difficulties with the pink-red-magenta cluster remain.
SECTION FOUR
Current Stations on the Metropolitan Line
The Metropolitan Line currently serves 34 stations across its main route and branches. The stations are listed below from east to west, with opening dates and key notes.
| STATION | OPENED | NOTES |
|---|---|---|
| Aldgate | 1876 | Inner terminus; shared with Circle and H&C lines |
| Liverpool Street | 1875 | Major interchange; rebuilt 1990s |
| Moorgate | 1865 | Original terminus before westward extension |
| Barbican | 1865 | Opened as Aldersgate Street; renamed 1968 |
| Farringdon | 1863 | One of the original 1863 stations; Crossrail interchange |
| King’s Cross St. Pancras | 1863 | Original station; major six-line interchange today |
| Euston Square | 1863 | One of the seven original 1863 stations |
| Great Portland Street | 1863 | Original station; smallest on the line |
| Baker Street | 1863 | Key interchange; original 1863 station; Sherlock Holmes link |
| Marylebone | 1863 | Opened as Lisson Grove; renamed 1917 |
| Edgware Road | 1863 | One of original seven; Circle/H&C interchange |
| Paddington | 1863 | Original terminus; now Elizabeth line interchange |
| Royal Oak | 1871 | Circle/H&C lines only from here westward |
| Westbourne Park | 1866 | Surface station |
| Ladbroke Grove | 1864 (as Notting Hill) | Renamed 1919; H&C only |
| Latimer Road | 1868 | H&C only |
| Wood Lane | 2008 | New station opened for Westfield/Olympics area |
| Shepherd’s Bush Market | 1914 | H&C only; named for adjacent market |
| Goldhawk Road | 1914 | H&C only |
| Hammersmith | 1864 | H&C/District terminus |
| Harrow-on-the-Hill | 1880 | Major junction; Chiltern Railways interchange |
| North Harrow | 1915 | Local suburban station |
| Pinner | 1885 | Classic Metro-land suburb |
| Northwood Hills | 1933 | One of the last Met stations opened pre-LPTB |
| Northwood | 1887 | Extended Met into Hertfordshire |
| Moor Park | 1910 | Near Moor Park golf course; classic Metro-land |
| Croxley Green | CLOSED | See closed stations table below |
| Watford | 1925 | Branch terminus; short shuttle service |
| Rickmansworth | 1887 | Junction for Watford branch |
| Chorleywood | 1889 | Hertfordshire; Arts & Crafts village station |
| Chalfont & Latimer | 1889 | Junction for Chesham branch; Chiltern Hills |
| Chesham | 1889 | Branch terminus; most rural Met station |
| Amersham | 1892 | Joint terminus with Chiltern Railways; zone 9 |
| Aylesbury | 1892 (Met) / 1863 (GWR) | Now served by Chiltern Railways only, not TfL |
Note: The Metropolitan Line shares track and stations with the Circle and Hammersmith & City lines across the inner sections of the route. From Paddington westward, Met Line trains broadly diverge from the Circle/H&C services.
SECTION FIVE
Stations That Have Gone: Closures and Lost Stops
The Metropolitan Line’s long history and its many extensions and branch lines mean that it has also accumulated a significant list of closed or relocated stations. Some were victims of changing passenger patterns, others of wartime damage or post-war rationalisation, and some were simply superseded when a nearby station was rebuilt and relocated. The following table records the principal stations and halts that once served the Metropolitan Railway or its successor lines but no longer appear on the map.
| STATION | OPENED | CLOSED | NOTES |
|---|---|---|---|
| Bishop’s Road (Paddington) | 1863 | 1933 | Original western terminus; replaced by modernised Paddington station |
| Praed Street (Paddington) | 1868 | 1933 | Separate Circle line platform; consolidated into main Paddington station |
| Marlborough Road | 1868 | 1939 | Between Baker Street and St. John’s Wood; closed on opening of Jubilee line predecessor |
| Lords (St. John’s Wood) | 1868 | 1939 | Opened as St. John’s Wood Road; closed and replaced by new St. John’s Wood station |
| Verney Junction | 1891 | 1936 | Northernmost point ever reached by the Metropolitan; rural Buckinghamshire; very low usage |
| Quainton Road | 1868 (GWR) | 1936 (Met) | Now preserved as Buckinghamshire Railway Centre heritage site |
| Waddesdon Manor Halt | 1897 | 1935 | Private halt serving Rothschild estate; never public |
| Granborough Road | 1897 | 1936 | Brill branch station |
| Winslow Road | 1897 | 1936 | Rural Brill branch halt; closed with branch |
| Brill | 1872 | 1935 | Terminus of the Brill Tramway/branch; one of the most remote Met outposts |
| Wood Siding | 1906 | 1915 | Temporary halt near Chalfont; short-lived |
| Croxley Green | 1925 | 2003 | Watford branch halt; closed in 2003; potential reinstatement long debated |
| Aylesbury High Street | 1863 | 1953 | Original Aylesbury terminus; replaced by enlarged GWR/BR station |
| Uxbridge Road (Shepherd’s Bush) | 1864 | 1914 | Replaced by new stations when Hammersmith & City line reconfigured |
Several of the Metropolitan Railway’s most remote outposts, particularly those on the Brill branch and the Verney Junction extension, represent some of the most eccentric episodes in British railway history. The Brill Tramway, which the Metropolitan absorbed in 1899, was a narrow-gauge light railway running through Buckinghamshire farmland to the village of Brill, some fifty miles from central London. It was, by any measure, an improbable appendage to an underground railway, and the London Passenger Transport Board closed it without ceremony in 1935.
SECTION SIX
The Metropolitan Line on the Map: A Visual History
The Metropolitan Line’s appearance on printed maps of the London underground system has changed substantially across the 160-plus years of the network’s existence. Tracing those changes is, in effect, tracing the history of how Londoners have understood and navigated their city.
The Geographical Era (1863–1930s)
The earliest maps of the Metropolitan Railway were conventional geographical railway maps: drawn roughly to scale, they showed the line in relation to the streets, parks, and landmarks of London above. The Metropolitan was typically shown in a distinctive colour, crimson or dark red in many early examples, against the pale background of the street plan. These maps were functional but demanding: reading them required the passenger to have some prior knowledge of London’s geography, and the density of information on even a moderately accurate map of central London made the underground routes difficult to read at a glance.
As the network grew more complex through the 1890s and 1900s, with the Metropolitan, District, City and South London, Central London, and Great Northern & City railways all operating in the same geographical space, the geographical map became increasingly unwieldy. Various designers attempted to simplify the information by straightening curves and reducing detail, but the basic commitment to geographical accuracy was maintained.
Beck’s Diagram and the Metropolitan (1933)
Harry Beck’s 1933 diagrammatic map transformed the presentation of the Metropolitan Line as it did every other line on the network. Beck’s key insight, that passengers needed to know sequence and interchange, not geographic distance, allowed him to show the Metropolitan’s long outer arms in a format that was legible within the same diagram as the tightly packed inner-city stations. The Metropolitan was assigned its dark red-purple, running horizontally across the top of the diagram before turning northwest toward the Chilterns.
For the Metropolitan, Beck’s diagram presented a particular challenge: the line’s outer sections were genuinely longer and more geographically dispersed than any other part of the network, and representing them honestly within the diagram required the map to extend considerably beyond the zone occupied by the other lines. Early Beck maps handled this by simply running the Metropolitan off toward the top-left corner of the page, with Aylesbury appearing as a distant terminus far beyond the central diagram. Later revisions trimmed the outer sections, sacrificing some geographic intelligibility for overall compactness.
The Colour’s Evolution on the Map
The Metropolitan’s colour on the Beck diagram has changed subtly over the decades. The original 1933 map used a dark, slightly brownish crimson that is closer to what we would now call a dark maroon. Through successive printings and revisions in the 1940s, 1950s, and 1960s, the colour shifted toward a cleaner, brighter magenta. The standardisation of the current Pantone 235 C shade, a vivid, warm pink-magenta, was part of the broader corporate identity work undertaken by London Transport and later TfL from the 1980s onwards.
The arrival of the Hammersmith & City Line as a separately marketed service in 1990 (though the route had existed for many decades) required a new colour adjacent to the Metropolitan’s magenta. The pink assigned to the Hammersmith & City (Pantone 185 C in its current specification) sits immediately adjacent to the Metropolitan’s magenta on the map, creating a potential source of confusion for colour-blind passengers — a problem that TfL has acknowledged but not yet fully resolved.
The Modern Map and the Metropolitan’s Place in It
On the current official TfL Tube map, in its post-2022 revision, which incorporates the Elizabeth line, the Metropolitan occupies a distinctive position in the upper-left portion of the diagram. Its route from Aldgate through Baker Street and out to Amersham and Watford is rendered with the characteristic horizontal emphasis of the Beck tradition, though the outer sections diverge into a branching structure that requires careful reading. The line’s length, it is the longest on the Underground, means that it spans more of the diagram than any other route, from Zone 1 at Aldgate to the Chilterns stations that sit in what the map designates as the outermost zones.
Historical enthusiasts have produced numerous alternative and retrospective maps of the Metropolitan Line, reconstructing what the network looked like at various points in its history. The Museum of London and the London Transport Museum both hold collections of printed maps dating from the 1860s onwards, and facsimile reproductions of the most historically significant maps, including the 1933 Beck original, the 1908 combined underground map, and various Metropolitan Railway company publications, are widely available. These maps serve not merely as historical documents but as navigational artefacts: each one is a record of how the city understood itself at a particular moment, and the Metropolitan Line, running through all of them in its various crimsons, maroons, and magentas, is a continuous thread connecting the Victorian city to the contemporary one.
SECTION SEVEN
Legacy: What the Metropolitan Line Left Behind
The Metropolitan Line’s legacy operates on several levels simultaneously: physical, urban, cultural, and conceptual. Each layer has shaped not only London but the wider world of urban transit.
The Physical Legacy: Suburban London
The most tangible legacy of the Metropolitan Railway is the landscape it created. The outer suburbs of north-west London, Harrow, Pinner, Northwood, Rickmansworth, Chorleywood, exist in their current form because the Metropolitan extended its tracks through them in the 1880s and 1890s and then actively marketed them as places to live. The semi-detached houses, mock-Tudor high streets, golf clubs, and tennis courts of these communities were built by developers who understood that the railway made them viable, and who worked, often in close collaboration with the Metropolitan Railway Company itself, to populate the countryside through which it ran.
The Metropolitan Railway was, in this sense, not merely a transport company but a property developer. It created the Metropolitan Railway Country Estates Limited in 1919, a subsidiary specifically tasked with developing housing along its outer lines. The company built estates at Wembley Park, Rayners Lane, and elsewhere, designing houses, laying out roads, and selling plots to the professional families that its guidebooks described as the natural inhabitants of Metro-land. When the LPTB absorbed the Metropolitan in 1933, it was required by the terms of the absorption to divest the country estates subsidiary, a public transport body, Parliament judged, should not be a house builder. The subsidiary was sold off, but the landscape it had created remained.
The Conceptual Legacy: Urban Transit Worldwide
The Metropolitan Railway’s most far-reaching legacy is conceptual rather than physical. By demonstrating, in January 1863, that a steam railway could operate successfully beneath the streets of a major city, it proved a proposition that the world’s other great metropolises would spend the following century acting upon. Budapest (1896), Glasgow (1897), Boston (1897), Paris (1900), Berlin (1902), New York (1904), Philadelphia (1907), Buenos Aires (1913), each of these cities built its underground railway in conscious knowledge of the London precedent. The engineers, politicians, and financiers who promoted these projects studied the Metropolitan, visited London, and argued that what London had demonstrated was replicable.
The Metropolitan’s specific technical solutions, cut-and-cover construction, condensing locomotives, iron-and-brick tunnel linings, were widely adopted, modified, and improved. Its financial model, a private company funded by a combination of mainline railway investment and City capital, operating under Parliamentary authority, was replicated in various forms around the world. Its social proposition, that an urban railway could open the countryside to the city-dweller and the city to the suburbanite, inspired transit-oriented development in cities from Chicago to Tokyo.
The Cultural Legacy: An Institution
In cultural terms, the Metropolitan Line has acquired a significance that extends well beyond its function as a means of transport. It appears in literature, in the poems of John Betjeman, who wrote of ‘Metroland’ with a tenderness that surprised readers who expected satire; in the fiction of Arnold Bennett and H.G. Wells, who used the underground railway as a setting for stories about the modern city; in countless travel memoirs and journalistic accounts of London’s physical and social geography. The line’s association with the Sherlock Holmes stories, Baker Street station is explicitly referenced in several Conan Doyle tales, has given it a particular resonance for readers around the world.
The Baker Street station itself, rebuilt and expanded many times since 1863, retains in its deepest sections the original brick-arched platforms of the Metropolitan Railway, now used by Bakerloo and Jubilee line trains. Standing on those platforms, beneath the curved Victorian brickwork, passengers who know the station’s history can sense the connection to the January morning in 1863 when the world’s first underground railway opened, and the city beneath the city began.
Every metro system in the world, in Paris, New York, Tokyo, Moscow, and a hundred other cities, is, in some sense, a descendant of the Metropolitan Railway.
The Metropolitan Line turns 163 years old in January 2026. Its rolling stock is modern, its signalling is digital, and its stations are a palimpsest of Victorian brick, Edwardian tile, mid-century concrete, and contemporary glass. The magenta line on the map looks much as it always has: a long diagonal reach from the city into the countryside, connecting London’s densest streets to its quietest hills, as it has done, without interruption, for more than a century and a half. No other line on any underground system in the world can say the same.
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