Most laptop supplies will work over a wide spread of power sources most are quite tolerant of the voltage and frequency. The principle issue on train is the frequency which is not a issue to a power supply unless it drops seriously, the coach lights would go nuts if that happened
The Mk2d is for the more adventurous in search of some juice
That said the worst source of juice is the refubished DART coaches, the secondary power system on them has always been weak
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