| http://www.w3.org/ns/prov#value | - there are 20 miles (32 km) of cut-and-cover tunnel and 93 miles (150 km) of tube tunnel.[1] Many of the central London underground stations on deep-level tube lines are higher than the running lines to assist deceleration when arriving and acceleration when departing.[68] Trains generally run on the left-hand track, although in some places the tunnels are above each other, for example the Central
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