The words "up" and "down" refers to the difference in mean RLs of the two station. For example if a train travels between stations "A" and "B" and the mean RL of A is more than the mean RL of B, then a train travelling from A to b will be referred to as DOWN and the train travelling from B to A will be referred to as UP.
If the ballast underneath the tracks have sunk then it will go up down up down under each locomotive.
It slows down.
You may be referring to Train Train by Blackfoot.
in NYC jargon, the 'uptown' train heads north and the 'downtown' train goes south
Moving up and down quickly and erratically.
To swing from side to side or up and down.
jumping up and down
a train whose speed is more than that of sound
The Capricornian or the Sunlander
A train stops and starts by the train Handel the man who's driving that train has a Handel that he pulls so the train can go faster and slower. Like up is faster (when he pulls) and down is slower.
push up to go flat down with your hands on the ground going up and down
A road that does not change in elevation either up or down.