sentences:  A larger single deck, the rear-engined RE, was produced in 1962 and shorter versions to replace the MW appeared in 1968 along with a Lightweight Horizontal engined chassis, to replace the SU midibus and sell to the private sector as a lightweight coach, the LH.The G was introduced in 1931 as a dedicated double deck chassis, but this was replaced by the K in 1937.Larger versions were offered as laws changed to allow an increase in both width and length, but in 1949 a radically different double deck prototype was tested.