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The SD42 was a bus made by Crossley between 1946 and 1952.

Production for the domestic market started in 1947. At first the buses were only for urban transport services and later became available for private operators. Crossley had not served this market segment before the Second World War so it was new territory for them.

Production

Dutch National Railways

The Dutch National Railways placed an order of 425 buses each with 43 seats and another 500 buses with 47 seats each. The buses were 8 feet wide which is one of the reasons why sales prospects in the home market were so low as the buses were noticeably wider that was what allowed at that time. The required speed of 60 mph was also significantly higher than the United Kingdom permitted. The longer buses were 35 ft ½ inch long and the shorter ones were 32 ft 11 1/8 in long.

Delivery of the buses began in 1947. The new larger and heavier the bus was fitted with a new engine that was able to produce 150bhp and reach the speeds the Dutch National Railways requested. The new engine was designated HOE9. A manual five-speed gearbox was fitted. In practice, the engine had problems with the oil supply, which is why some buses were changed back to having the HOE7 engine. The buses were fitted with air brakes by Westinghouse. 150 of the buses delivered were fitted with Crossley bodies, the rest were fitted with bodies of Dutch producers. Some of these buses had the front entrance door moved so that they were suitable for one-man operation.

Other Markets

On the home market, 111 SD42s were completed as buses and 625 as coaches. Nine were exported to Uruguay, eight to Denmark and one each to Portugal and New Zealand.

191 SD42s had Crossley bodies, the remainder were supplied to independent coachbuilders. Two were bodied as trucks and one as a horsebox.

Except for four exported to Uruguay that had the supercharged Crossley HOE9, the HOE7 8600cc diesel engine was used with direct injection. The buses were also fitted with either a four or five-speed gearbox and a dry single-plate clutch. The chassis was fitted with semi-elliptic leaf-springs and the differential was offset to the left side on the rear axle.