Moving forceor moving mass

Hello
friends 

I
read about 3D beam to define it for a surface-to-surface contact, as you said 3D
beam surfaces can only be used as slave surface in contact definition, so I decide
do another way which it does not need define an interaction, I want to define
the moving train as a moving force or mass, now how I could do it? I don’t know
how I could make a mass or concentrate force move.

Sincerely