Pullman sets but ultimately decided against it. Design The sets had a maximum speed of . The fixed couplings reduced much of the jerky movement experienced by conventionally buffered carriages and allowed smooth acceleration and stable running. The bogies had hydraulically-damped helical springs, and the axles were pneumatically braked in a two-stage system, allowing highly-controlled stopping. They were air-conditioned with automatic humidity control. Motor cars had a large primary diesel engine and generator for motive power, and a secondary Rolls-Royce C8NFLH diesel engine and auxiliary 150 kVA 3-phase 400 V generator beneath the floor provided power for the air-conditioning, fridges and ancillary equipment. A single auxiliary per set was normally sufficient. An onboard Travelling Maintenance Attendant monitored the supply of services. Seating was 2+1 armchair-type around tables with a table lamp and with steward call button. The saloons were protected from track noise by extra insulation in the bodywork and double-glazed windows with Venetian blinds between the panes. Livery To emphasise the new type of service, a Nanking blue livery and associated brand image replaced the traditional Pullman livery of brown and cream, and cars bore the word "PULLMAN" rather than individual names. Seating was also different from traditional first-class Pullman cars, increasing from 1+1 to 1+2. The original livery was Nanking blue with white window surrounds and the Pullman crest on the front and sides. From mid-1966 full wrap-around yellow ends were applied to the driving cars. From October 1967 the sets were repainted in a reverse corporate blue and grey livery, similar to other Pullman coaches and the prototype Class 252, though some retained the Nanking blue livery into 1969. Technical details Power car (one at each end of set): Introduced: 1960 Weight: 67 tons 10 cwt Engine: NBL/MAN Motors: two GEC traction motors (plus two on the adjoining car) Maximum tractive effort: Not known First, second and third bogies from each end were of 9 ft 6 in wheel centres, all other inboard bogies had 8 ft 6 in centres. The four traction motors at each end were mounted on the second and third bogies. Driving wheel diameter: 3 ft 6 in Coupling code: Unknown Train heating: Electric, powered by Rolls-Royce underfloor engine on adjoining vehicle Formation The sets were formed from six types of car: 1st class motor car, 2nd class motor car, second class parlour car with under-floor diesel generator (see train heating engine above),