Noone has provided the actual meaning to the TranslateAll command yet, so let me explain. It's quite simple, really.
Look at the word Translate. It's a math term that also means "to slide" or "to move".
So, the TranslateAll command simply moves the entire object (hence the All after the word Translate). Why are there three values after it? Because the object will be moving according to the x-,y-,z-coordinate values that you assigned to the command.
Looking at the command, I can see that the train object that is referred to is built negatively. In [TranslateAll 0, 0, 9.25], only the z-value is defined and positive. That means the object is simply being moved (in the z-axis) so the center of the train object is sitting at the origin (0,0,0).