20 Facts About Piccadilly line

Piccadilly line is a deep-level London Underground line running from the north to the west of London.

The Piccadilly line was extended again twice, to Terminal 4 via a loop in 1986, and to Terminal 5 directly from the main terminal station in 2008.

The Piccadilly line then descends into twin tube tunnels, passing through Wood Green, Finsbury Park and central London.

West of Hatton Cross, the Piccadilly line enters tube tunnels to Heathrow Airport and branches to the Terminal 4 loop or to a terminus at Terminal 5.

The Piccadilly line was further extended to Enfield West on 13 March 1933 and finally to Cockfosters on 31 July 1933, again without ceremonies.

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The Piccadilly line would run on the inner pair of tracks, and the District line on the outer.

An enhanced off-peak Piccadilly line service was introduced on 29 April 1935, cutting off-peak District line services down to the Acton Town–South Acton shuttle.

The Piccadilly line had to cross River Crane just east of Hatton Cross, therefore it emerges briefly on a bridge, with the two portals having concrete retaining walls.

In March 1965, a British Rail and London Transport joint planning committee published "A Railway Plan for London", which proposed a new tube railway, the Fleet Piccadilly line, to join the Bakerloo Piccadilly line at Baker Street then run via Aldwych and into the City of London before heading into south-east London.

The Piccadilly line platforms remained open, but with the escalators to the ticket hall closed for repairs.

On 7 July 2005, a Piccadilly line train was attacked by suicide bomber Germaine Lindsay in the day's London bombings.

The Piccadilly line bomb led to the largest number of fatalities, with 26 people reported killed.

Green Park received a new shelter at the southern entrance; Piccadilly line Circus had its ticket hall moved below street level.

South Ealing, where a temporary wooden station ticket hall was constructed when the Piccadilly line was quadrupled, was an anomaly; a modern station was not provided until the 1980s.

The Piccadilly line extensions resulted in resignalling on tracks west of Barons Court.

Trains entering service on the Piccadilly line had to reverse and enter the District Piccadilly line tracks first via West Kensington.

Patronage on the Piccadilly line increased greatly after the war, which meant additional trains were needed.

Piccadilly line is to be upgraded under the New Tube for London scheme, involving new trains as well as new signalling, increasing the line's capacity by some and reducing journey times by one fifth.

Siemens publicised an outPiccadilly line design featuring air-conditioning and battery power to enable the train to run on to the next station if third and fourth rail power were lost.

Resignalling work on the Piccadilly line was to begin in 2019 but this has since been shelved because of lack of funds.