Locking is provided by a key lock in the centre of the door moving two square sliding lock bars in and out of holes in the door tracks, locking and unlocking it, or by the solenoid lock in the automatic motor.
12.
"' Ceramic ball integrated into integral lock bar "' Also introduced as a feature in the Umnumzaan, the ceramic ball embedded into the end of the lock bar, creating the interface between the blade locking surface and the integral locking arm surface.
13.
"' Ceramic ball integrated into integral lock bar "' Also introduced as a feature in the Umnumzaan, the ceramic ball embedded into the end of the lock bar, creating the interface between the blade locking surface and the integral locking arm surface.
14.
:: : : The RAIB interim report on the derailment here says ( paras 27 / 28 ) that out of the three stretcher bars and the lock bar that should have maintained the correct separation between the switch rails, one was missing, two were fractured ( one possibly as a result of the crash ) and bolts on two bars were missing.
