Editing Waterloo & City line (section)

====Independent proposals====
A [[Waterloo and Whitehall Railway]] was promoted in 1864, to construct a tube railway from [[Great Scotland Yard]] to Waterloo. It was to use air pressure to propel the vehicles northwards, and exhaust air to draw them southwards, using a pressure differential of {{frac|2|1|2|}} oz per sq in (about 11 mbar). The trains themselves would be the pistons. The company capital was to be £100,000. It was suggested that there could be a branch to where the [[Embankment station]] is now located: it is not clear how a junction would be managed in a pneumatic railway. There were to be three vehicles, one loading at each terminal and one in motion in the tube, so they must have been intended to pass at the terminals. There were to be three classes of accommodation in the coaches.

Work started on 25 October 1865, but less than a year later it was obvious that the capital was grossly inadequate. Authority for extension of time and more capital was obtained, but by then few investors had any confidence that their investment would gain a return. In 1868, a further extension was granted, but little further work was done, and nearly all the money had gone.

In 1881, an independent Waterloo and City Railway was promoted, to build a surface line to Queen Street. The cost was formidable at £2.3&nbsp;million, and the proposal soon collapsed.{{sfnp|Gillham|2001}}