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Terence Charles Barry Miller, MBE (21 August 1911 – 1989) was a British railway engineer who rose to become Chief Engineer (Traction & Rolling Stock) for British Rail.
Miller began his career with the London and North Eastern Railway (LNER) as an apprentice, working under Nigel Gresley. He rose up the ranks of LNER and continued his career under British Rail (BR) after nationalisation. In the New Year Honours list of 1956, he was awarded the MBE; he was at that time the Assistant Motive Power Superintendent of British Railways Eastern region.
By the 1960s, when BR was withdrawing steam locomotives and dismantling facilities for them, Miller was one of several people who provided support to Alan Pegler in his attempts to run the preserved LNER Class A3 4472 Flying Scotsman.
He was appointed Chief Engineer (Traction & Rolling Stock) in 1968. It was in this position that Miller was credited with instigating the development of the InterCity 125, known as the High Speed Train (HST). At the time, BR was focused on developing an electric Advanced Passenger Train (APT), but by 1969 the APT project was significantly behind schedule. As a stop-gap measure, engineers devised plans for a 125-mile-per-hour (200 km/h) "High Speed Diesel Train", which Miller submitted to the British Railways Board (BRB) at the beginning of 1969; the submission won the endorsement of Sir Henry Johnson, chairman of BRB. The HSDT eventually became the InterCity 125, introduced into service from 1975. Although the HST was intended to fill in for the APT, the APT project was eventually abandoned and the HST remains in regular service as of 2014.
Miller retired in 1973, three years before the HST entered service.
He died in 1989.