Just a thought I'll add: If you want to avoid clutter, you can turn off the arrows by clicking "on-screen help" either in the survayor options, or from the menu at the top left of Driver.
If you want to reskin a locomotive that doesn't have a paint-shed template, you need to make a copy of the locomotive and edit the config (to make it unique) and the image files (to change to colours) - they might be in the form .tga or .bmp, but sometimes people use other formats. Targas and bitmaps are those recommeded though.
Which version of Trainz are you using, Jon?
BidMod.