Hannover: Type 2 of TW 2000 series, numbered 25xx, has only one place
for the driver. Usually two of them are combined back-to-back, but to
allow a single car to go backwards for maintenance or else, they can
be controlled with a boy which can be placed in the closed door. Only
basic functions are available, but as there should be no passengers
on board, more is not necessary. Maximum speed is limited to 10 km/h.

Photo by Sven Herzfeld (s.herzfeld@maschsee.han.de)