The Leyland 2S gas turbine was developed by British Leyland to power road vehicles. The original version, the 2S/150[1][2] was famous for its use in a series of racing cars in the 1960s. In 1968, the basic layout was used to develop the larger 2S/350 for use in semi-trailers. The 2S/350 was also used in the British Rail APT-E train. Both were used only experimentally, development ended in the 1970s.