RAILROAD TERMS AND SLANG - All Aboard: The Complete North American Train Travel Guide - page 333

rerailer: A device used to guide a railcar's wheels back onto the
track following a derailment.
right-of-way: The strip of land on which a railroad track is laid.
rim: The outer circumference of the wheel on a railroad car or
locomotive; that is, the part of the wheel that comes into contact
with the rail.
rock and roll: Railroad slang for excessive side-to-side movement of
railcars caused by poor track conditions.
sander: A device operated from the locomotive cab that applies
sand to the rail just in front of the driving wheels to prevent them
from slipping. It is used going up steep grades or where ice or
snow has covered the tracks.
siding: A track located parallel or adjacent to a single main track
onto which one train is diverted to allow another train to pass.
signal: A mechanical or electronic device that communicates
instructions to the train crew relating to the train's speed, usually
in connection with other rail traffic or track conditions.
slide fence: These wire fences can be seen along the track where it runs
along steep cliffs or slopes with loose rocks. If the wire is broken by
falling rocks, a signal is automatically triggered and approaching
trains are warned of possible obstructions on the track.
snow fence: You'll see a lot of these along the tracks in the open
prairies of the West. They disrupt wind patterns and, if placed
properly, help to keep snow from drifting over the tracks.