London Underground infrastructure

The railway infrastructure of the London Underground includes 11 lines, with 270 stations. There are two types of line on the London Underground: services that run on the sub-surface network that is just below the surface and use larger trains, and the deep-level tube lines, that are for the most part self-contained and use smaller trains. Most of the lines emerge on to the surface outside the Central London area. The oldest trains currently in service on the Underground are used on the Bakerloo line - the 1972 Stock trains were introduced in 1972. The Underground is electrified using a four-rail system, the DC traction supply being independent of the running rails. Planned improvements include new stations, line extensions and more lines with automatic train operation (ATO).

London Underground infrastructure

The railway infrastructure of the London Underground includes 11 lines, with 270 stations. There are two types of line on the London Underground: services that run on the sub-surface network that is just below the surface and use larger trains, and the deep-level tube lines, that are for the most part self-contained and use smaller trains. Most of the lines emerge on to the surface outside the Central London area. The oldest trains currently in service on the Underground are used on the Bakerloo line - the 1972 Stock trains were introduced in 1972. The Underground is electrified using a four-rail system, the DC traction supply being independent of the running rails. Planned improvements include new stations, line extensions and more lines with automatic train operation (ATO).