Reply to "Grade on train layout"

Serenska posted:

Here's a lovely photo showing that 1-2% grades aren't necessarily the rule in the realm of 1:1 subways:

This is a NYC  Subway A train crossing a bridge near JFK airport.

Steven J. Serenska

Of course, most/all those cars have motors under them, so every car is helping to push the train up the grade, or retarding on the down grade, unlike freights and passengers trains being pulled at one end and maybe shoved at other end.