Train set might be the trickier one, since it's going to be a variable DC transformer... Check the rating to see if it will accept 120; if not, replacing the transformer shouldn't set him back too much unless he has a really big setup.
Are 120/240VAC (step-down) transformers of a few hundred VA not available in the US?
As for the lamp, dump it, it isn't worth worrying about.
No dis-respect to the UK members here, but I have met, I don't know how many English people that have come over here EXPECTING the gear they bring with them to instantly be able to be plugged in and work, regardless of the difference in plug configurations.
One guy actually tried to claim for new plugs on his insurance.
Umm, OK.
