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Can't speak for the 158s, but the turbos all have both USB and 3 pin mains sockets. There's a 3 pin socket and 2 USBs on the wall at each row of seats. They can be a bit hit and miss though, if they're not working in one coach, it may be worth trying another coach.
Yes a guard told me this was the case last year (around May) when I moved carriage and found a working socket. They were surprised it worked but concluded that particular carriage must have been missed out.
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