I haven't yet completed the grid but I think that I have the names of the trains, each of which is associated with a series of (three) figures. I presume that it is a case of fitting them in jigsaw wise wherever they will fit, but I'm not so sure about the lone square yet.
I have tried so many permutations of numbers in that grid that I have lost count ! Could you give me a nudge in the right direction ? (I have 260 262 280 282 440 442 462 482)