IN the 1st class cabins in the Thai trains there are power plugs, though not sure about how reliable they are. Not sure about second class.
#4 somtam2000 has been a member since 21/1/2004. Location: Indonesia. Posts: 7,739
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In addition to the 1st class cabins on Thai sleeper trains I seem to recall seeing powerpoints/sockets on the wall in the Sprinter trains (2nd class aircon seat cars). I'd be a bit hesitant to wack my laptop/iPod plugs into these (ages old) but you can have a go. No trains to speak of in Laos and Cambodia but maybe someone else can reply re. Vietnam etc.