Wonder if Didcot Railway Centre might take a vehicle, being the first electric trains to work on the "Great Western"?
Myth.
Not the first electric trains on real GWR.
Going backwards, Weymouth, electrified 1987, was GWR and only transferred to Southern Region by BR in ~1963, so that makes Vep Cig 442 etc way before 332. [[ GWR boat trains ran from Paddington, not Waterloo. ]]
If you want 25 kV, before that then, c.1970 was Oxley CS in to Wolverhampton (exclusive), which is on the GWR Padd - Birkenhead route. So you had ACL, not EMU. (( Oxley was not done 1966/1967, and was of lesser importance than later, in the orginal WCML AC timetable there no EBW in the base timetable pattern needing reversal at Oxley, far fewer ECS movements, 25s were used to haul to/from Oxley )).
OK, Oxley not passenger, but even before BR days passenger :
Kensington Olympia (then named Addison Road) etc was on the DC third rail electrified NLR / LNWR / LMSR network 1920s; the route was joint GWR owned, operated by 'LM' owned EMU stock but nonetheless over GWR track. [[ De-electrified 1950s? Subsequently re-electrified 1990s under channel tunnel works. ]]
And then the Hammersmith & City, another joint GWR route, and it even includes Paddington. And here GWR owned a proportion of the stock, and least to formation of LT, and probably continued owning after, I'll leave someone else to answer that bit.
OK digression from the end of 332s, probably does not belong in this tread, but that myth needs dispelling, as it was brought up here.
There are no doubt other examples.
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