Can anyone tell me the steepest mainline
gradients on US transcontinental lines?
I think you'll find them moderately steep -
came through the Rockies in 1997 on the California Zephyr and would be
surprised if they weren't around 1 in 40 in places. The Americans have
latterly used pretty powerful locos, particularly in the mountainous
country. The Cajun Pass, on UP's line in California is 1 in 36.
Suggest you try a posting to misc.transport.rail.americas or alt.railroad,
you'll most likely get replies as a percent grade from the
locals.
regards
David Bennetts
Canberra