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Apparently they were originally ordered for the Domestic CTRL ?, at least one of the random things that I've heard but obviously they weren't used for that.
375601 did run under AC at the Old Derby Test Track when it was first built, other than that, no other 375/6 has moved using AC
All 375/6's can raise and use their panto's any time they like as it's regularly inspected and repaired as it's part of the train, it's treated like a component which is used in normal service which is most unlike Southeastern!
And dont quote me on this but i heard rumours that 375624 has a ex-395 panto but i could be wrong on that as it looks just like the others
I don't know, you'd have to ask someone who knows more about them technically. I do wonder if theyve been tested and maintained as part of routine maintenance or if theyve just just been ignored? I'd expect the latter?