trucks

[Rail-Runner192]

Yes the Brake van is the same as the freight cars. As for the coaches I dont remember a weight inside.

[Rickenbacker 325]

no its not because there is no under screw

[metal4life]

There are weights inside of Annie & Clarabel, too. I'm not sure about the Brake Van. I can almost surely say that there is not, due to it's length.
But I could be wrong.

[Rail-Runner192]

James is rigt I forgot to say there is a screw My Bad