The [Class 180] consistently being split up and sent to different depots and companies for maintenance every so often throughout their lifetime. As every engineer has his style of maintaining things and as the fleet kept having problems, it was hard to keep track of what work had been carried out on each train.
Do trains not have a service record that travels with it?
(thinking like a car here).
I guess individual companies will do things differently, but I would have thought the owning company would keep a record?