Another six railroad terms in this series:

Three-Step Protection
A safety procedure used for the protection of workers going on, under, or between cars.(1) Apply the brake.(2) Center the reverser.(3) Put the generator field switch in the OFF or OPEN position.

Tons of Operative Brake
Is calculated by dividing the gross trailing tonnage of a train (not including the locomotives) by the total number of cars with operative brakes. Abbreviated as TOB.

Track Barricade
When access to the track is blocked by a sign or obstruction fastened to a track.

Track Car
Equipment, other than trains, operated on a track for inspection or maintenance.
Abbreviated as TC.

Trainmaster
An executive officer who supervises train service operations at terminals, in yard service, and on one or more divisions (or on part of a division).

Turn-Around
A train operated from a terminal to an intermediate station and returned to that terminal in one work shift.