The southbound Bakerloo line platform at Charing Cross Underground Station in central London, showing the distinctive narrow tube tunnel built in the early 1900s. The red-edged lining around the tunnel mouth and the tiled passageway reflect classic London Transport design standards. Opened in 1906, the Bakerloo line was one of the early deep-level “tube” lines, and this station once served as its southern terminus before extensions carried it to Elephant & Castle. The signage and steep staircases illustrate the compact engineering that defined London’s early subterranean railways.