Euston was expanded after the L&BR was amalgamated with other companies to form the London and North Western Railway, and the original sheds were replaced by the Great Hall in 1849.

A terminus at Camden Town, announced by Stephenson the following year, received royal assent on 6 May, before an extension was approved in 1834, allowing the line to reach Euston Grove where the original station was built by William Cubitt.

[42] The National Railway Museum's collection at York includes Edward Hodges Baily's statue of George Stephenson from the Great Hall;[43] the entrance gates;[44] and a turntable from 1846 discovered during demolition.

[48] He proposed an American-inspired station that would involve removing or resiting the arch, and included office frontages along Euston Road and a helicopter pad on the roof.

[47][49] Redevelopment began on 12 July 1938, when 100,000 long tons (101,605 tonnes) of limestone was extracted for the building and new flats were constructed to rehouse people displaced by the works.

[50] Because of the restricted layout of track and tunnels at the northern end, enlargement only could be accomplished by expanding southwards over the area occupied by the Great Hall and the Arch.

On 16 October 1961, 75 architects and students staged a demonstration against its demolition inside the Great Hall and a week later Sir Charles Wheeler led a deputation to speak with the Prime Minister Harold Macmillan.

[53] The station was rebuilt by Taylor Woodrow Construction to a design by London Midland Region architects of British Railways, William Robert Headley and Ray Moorcroft,[54][55] in consultation with Richard Seifert & Partners.

[56] Redevelopment began in summer 1962 and progressed from east to west, the Great Hall was demolished and an 11,000-square-foot (1,000 m2) temporary building housed ticket offices and essential facilities.

[12] In 1966, a "Whites only" recruitment policy for guards at the station was dropped after the case of Asquith Xavier, a migrant from Dominica, who had been refused promotion on those grounds, was raised in Parliament and taken up by the Secretary of State for Transport, Barbara Castle.

The offices are in a functional style; the main facing material is polished dark stone, complemented by white tiles, exposed concrete and plain glazing.

[61] Few remnants of the older station remain: two Portland stone entrance lodges, the London and North Western Railway War Memorial and a statue of Robert Stephenson by Carlo Marochetti, from the old ticket hall, stands in the forecourt.

[64] Other pieces of public art, including low stone benches by Paul de Monchaux around the courtyard, were commissioned by Network Rail in 1990.

[18] In 2005 Network Rail was reported to have long-term aspirations to redevelop the station, removing the 1960s buildings and providing more commercial space by using the "air rights" above the platforms.

As part of the extension beyond Birmingham, the Mayor of London's office believed it will be necessary to build the proposed Crossrail 2 line via Euston to relieve 10,000 extra passengers forecast to arrive during an average day.

[93] In August 2019, the Department for Transport (DfT) ordered an independent review of the project, chaired by the British civil engineer Douglas Oakervee.

[94] The Oakervee Review was published by the Department for Transport the following February, alongside a statement from the Prime Minister Boris Johnson confirming that HS2 would go ahead in full, with reservations.

[96] In Summer 2020, the government asked Network Rail's chairman, Sir Peter Hendy, to lead an oversight board; in October 2020, the Architects' Journal reported that more than £100m had already been spent on engineering and architectural design fees.

[96] In October 2023, the Prime Minister Rishi Sunak announced that construction of the Euston terminus and approach tunnel would not be government funded and that it could only go ahead with private sector investment.

[98] The demolition of the original buildings in 1962 was described by the Royal Institute of British Architects as "one of the greatest acts of Post-War architectural vandalism in Britain"[99][100] and was approved directly by Harold Macmillan.

[101] The attempts made to preserve the earlier building, championed by Sir John Betjeman, led to the formation of the Victorian Society and heralded the modern conservation movement.

[102] This movement saved the nearby high Gothic St Pancras station when threatened with demolition in 1966,[103] ultimately leading to its renovation in 2007 as the terminus of HS1 to the Continent.

[104] Euston's 1960s style of architecture has been described as "a dingy, grey, horizontal nothingness"[105] and a reflection of "the tawdry glamour of its time", entirely lacking in "the sense of occasion, of adventure, that the great Victorian termini gave to the traveller".

[106] Writing in The Times, Richard Morrison stated that "even by the bleak standards of Sixties architecture, Euston is one of the nastiest concrete boxes in London: devoid of any decorative merit; seemingly concocted to induce maximum angst among passengers; and a blight on surrounding streets.

The introduction of lifts in 2010 made the taxi rank and underground station accessible from the concourse, though some customers found them unreliable and frequently broken down.

[114] In October 2024, London TravelWatch warned that passengers at Euston are being put in danger when the station becomes severely overcrowded during periods of disruption to services.

[115] Transport Secretary Louise Haigh subsequently asked Network Rail to declutter the station concourse and improve how it handles train announcements.

[117] On 26 April 1924, an electric multiple unit collided with the rear of an excursion train carrying passengers from the FA Cup Final in Coventry.

[119] Extensive but superficial damage was caused by an IRA bomb that exploded close to a snack bar at approximately 1:10 pm on 10 September 1973, injuring eight people.

Transport for London (TfL) plans to change the safeguarded route for the proposed Chelsea–Hackney line to include Euston between Tottenham Court Road and King's Cross St Pancras.