EDIT:// As i searched the web i found that (isnt that to heavy as well)
Multiple things there. It's either electric or it is the last car of a bi-directional commuter train, so there is no engine or its accesories, the heaviest parts. It may be electric, which is all in the trucks and that one has no trucks. That could also be a shell going to another state or country, hence less weight.
The main thing in all of this is, what are you going to do with loads of this stuff being shipped around your map? As to Steam Engines, one place buys one or two from another once or twice in a decade and they have to be moved by rail. Or you get a real F-up like they did here in Illinois about 2 decades ago and decide that all the Steam Engines displayed around the state should all be in one place, and they moved them by truck or rail. Now they are in buildings up in Union Illinois where they MIGHT be seen or run if they find the time to work on them.
Stick with train cars and more common loads.
As to trains running with the engine in the rear, that is done from a local pick-up to a yard or from the yard to a local drop off, not cross country.
derailed, you are making more work for yourself than you need to and asking for others to assist you to make it work. It's not worth the time to the few we have that can do any of it or the fewer that would have to figure it out.
Build a map, skin existing equiptment and let's see what you can do.