Trains are easy and they’re easily electrified already. So putting solar on the trains won’t have any advantage.
Rails are the difficult part of railways. They never seem to put them between my house and my work. They’ve put something called a road in between instead.
Due to a quirk of unifying 2 standards, Europe and the UK, the range is 216.2 volts to 253.0 volts.
That encompasses infrastructure built to a tighter tolerance around 220V in Europe and infrastructure built to a tighter tolerance around 240V in the UK (and Australia).
We expect 3150W out of a kettle most of the time. Our heaters will say 3kW.
Usually you’ll find a few volts over 240 out of our outlets and that’s to design spec.