Pronunciation spelling of trailing.

present participle of trail off

(mechanics)

On a steam locomotive, a railroad truck to which wheel axles (and, hence, wheels) for one or more coupled pairs of unpowered wheels are attached through bearings, located behind the driving wheels.

On a steam locomotive, an axle connecting a coupled pair of unpowered wheels located behind the driving wheels.

(rail transport) On a steam locomotive, an unpowered wheel or axle located behind the driving wheels.

(rail transport, of points and crossovers) That converges in the direction of travel. / That is attached and pulled behind.

present participle of trail

Fabric or other material that trails.

(aeronautics) The rearmost edge of a wing or other airfoil.