Waterloo and Whitehall Railway

The Waterloo and Whitehall Railway was a proposed and partly constructed 19th-century Rammell pneumatic railway in central London. It was intended to run under the River Thames just upstream from Hungerford Bridge, connecting Waterloo station to the Whitehall end of Great Scotland Yard. The later Baker Street and Waterloo Railway followed a similar alignment for part of its route.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).