Seen it before, all Japanese units come with 4 sockets per coach, the Alstom units come with one at each coach end, they are provided for cleaners, many a phone charger I've seen plugged in
Mk3 coaches have a socket in the luggage rack, the Mk2d has a funny socket but if you plug in it is live no idea what voltage but laptop adaptors don't care
I have yet to find the sockets on a Mk4 the luggage rack drew a blank
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