I was on Gerald last night, when it failed at Rhyl. We were about 5 or so minutes down and when we tried to pull out of Rhyl, the train stopped straight away after.
Long story short, no brake release available from the DVT but loco was fine, we were told the set was to go back to Crewe to be fixed. A VT and ATW train passed us on the avoiding line and then the train limped back, in time for the 2150 (bearing in mind we had been there since 2035, and turfed off the train at about 2115) VT to pick us all up!
So thank you ATW for the free meal!
Edit: Do not know where the train went after that, it certainly did not stay at Rhyl, so did it get back there somehow without a loco? Or is there a loop or sidings somewhere nearby it would have gone into? The route it took seems to imply it can still only be driven from the loco, i.e. no reversal at Chester.
Double Edit: Just realised I should have bloody seen it as I was on the 1127 Holyhead - Birmingham train! If I'd have seen that it hadn't reached Crewe last night I would have watched out for it as I passed...