The Central London Railway began with Camel Backed Electric locomotives
hauling unpowered carriages. In order to improve efficiency distinct
humps (mini summits) were built into the track profile at stations from
Notting Hill to Liverpool Street - incoming trains were slowed by the
rising gradient whilst outbound trains were hastened on their way by
the falling out bound gradient. The heavy unsprung locomotives were
soon replaced by multiple units with intermediate powered bogies. Does
anybody know if humps are still built into station tracks on new tube
lines.