I have put the UP Big Boy steamer and tender on a route I am building. I tried running it with a consist of coal cars. When I go to the coal mine for loading, it also loads the Big Boy tender with coal. Then when I go to the power plant to unload, it unloads the tender along with the coal cars. Is there a rule that you can use to only load and unload cars? It seems like you shouldn't have to unload all your fuel from the steamer as you unload the consist cars. Maybe you just can't have the steamer so any coal work on the route. I wanted to set up a siding to load water and coal into the tender, but I suppose if I did that the coal loader would load the coal car consist also. Yikes !!! Any help would be appreciated...