I recently bought a GE 45ton Switcher (way cool). What is required for maintenance, lubrication etc. There was no instructions, only an exploded parts diagram.

Does anyone add weight to their engins / rolling stock? Is this done to scale or is that out of the question?
Best regards - Erik

I have just bought my first model train in 50 years (it's for my grandson, of course). The HO 4-8-4 engine has a bar with 2 holes in it and the tender has a pin to mate but it kept falling out. I bent the bar a little and that seems to work but I'm wondering if there should be a retainer or something on the pin?