Watch HDToday. Report No. 10 in a series of 13 topical films, covering: Hovercraft, Princess Ann; the Advanced Passenger Train; Design Centre exhibition, The next train; plasma torch, Derby Technical Centre; analysis of diesel oils, Glasgow science laboratory; bleep radio communications, Paddington; resignalling, Derby area; intercity coaches; evolved suspension, the Brighton Belle; Southern Region grouptravel; computer, Eastern Region; shipment of molten iron.