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The Waterloo and City Line, or the drain as it's fondly nicknamed, does what it says on the tin - it stops at Waterloo and the City (Bank) only.

Basically a shuttle from the largest station in the UK to the financial hub of the capital, the line makes life easier not only for the commuters who take it, but helps ease pressure on other T ube lines that travel around the same area.

The turquoise coloured line is by far the shortest on the Underground network, taking just four minutes and running a service about every five minutes, but as the least used line you may wonder why it's never been extended to make life easier for a few more people.

Well, throughout its 121 year history this has been proposed a number of times but for some reason or another the plans have never come to fruition.

(Image: PA)

In 1913 a private railway company considered proposals to join the Northern City Line to the Waterloo and City Line, but this never happened.

It was decided that any extension north would be too complex because of all the lines around Bank, and anything going south would not have a demand to match the costs.

In 1934 it was suggested that there be a new intermediate station at Blackfriars, making it an interchange with the District Line already at that station.

In addition it was proposed that the Waterloo and City line also be extended to Liverpool Street station, through Shoreditch, so that trains could then go to New Cross and New Cross Gate.

For unknown reasons the scheme was dropped.

In 1949 there was talk of adding a diversion from Fenchurch Street station to Bank, going through the Waterloo and City line tunnels to Waterloo and its suburban lines.

This would have meant boring out the narrow tunnels of the current line, so the costs were prohibitive.

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A Working Party Report in 1965 said that: "The possibility of extending the Waterloo and City Line northwards to Liverpool Street has been examined, but found to be physically impracticable."

More recently the Green Party has revived previous plans to connect the Northern City and Waterloo and City lines as part of the Crossrail route.