British Rail freight movement made fascinating - and fun.

TOPS stands for Total Operations Processing System: this fascinating, even fun, film tells the story of its computerised control of British Rail's freight carrying. British Transport Films once again prove their mastery of commissioned filmmaking, making a potentially dry subject gripping by following the progress of one wagon load of equipment on its journey from Truro to the Midlands.

All freight movements over Britain's rail network are monitored and controlled
by an advanced computer-based system known as TOPS (Total Operations Processing
System). The film follows the progress of a wagon load of equipment from Truro
to the Midlands and shows how TOPS makes it possible to accommodate a last
minute change of plan.