An account of the development of British Rail's experimental Advanced Passenger Train, designed to run at speeds of up to 155 miles per hour on existing track and to take curves some forty per-cent faster than conventional trains.
The film explains in simple terms some of the many novel design features of the APT, including the guidance system, the tilt mechanism and the hydro-kinetic brake, and shows the train in action during its trials.

16mm & V.C.