And trucks can go over mountains that trains can't, which the US has
a lot of.
Trains cross the Rockies every day. What other mountains did you have in
mind?

Hot flash for you; there are only a few places through the Rockies
where you can get a shallow enough grade for trains to make it.

There are lots of places through the Rockies where trucks can go
through.

--
Jim Pennino

I have seen where they put truck trailers on top of rail cars. Does
this increase the number of accesible passes for trains