In 1958 the SN range was introduced with conventional cab and controls, powered by a 450 hp Rolls-Royce V8 or 335 hp Cummins 6-cylinder engine, with 6 forward speed gearbox. Capacity was 30 tons, increased to 35 tons in the SN35 which had the Rolls-Royce V8 or a General Motors V12 2-stroke engine developing 476 hp. The SNs were replaced at 1970 by the Centaur range. About 800 copies were made.