I put this down to a lack of staff training. I witnessed a door failure in Tara Street on Friday evening, it took ages to sort out despite the process being extremely simple and a second member of staff being present
There is a mechanical lock in the top of one of the door leafs, turn that and another electric switch behind the door control panel and bingo, door out of service light comes on and door is secure. Safety reasons dictate you cannot have a leading or end door within a set locked out.
If the door physically won't close the train is immobilised until it can be sorted, the 7:12 is a 2800 set which has a weakness in a bracket which works loose which means the doors won't close until the bolts are tightened
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