In the early stage of its development the Motor Rail & Tram Car Company was involved in developing self-propelled tramcars, though the extent of production is not clear. In 1915 The Engineer magazine reported on the Simplex Rail Coach made in Lewes with the Brush Company building the body, delivered to the South Indian Railway Company where it was expected to be run on the Pamban Viaduct line. The coach weighed 12 tons, would carry 70 people, and was powered by a four-cylinder Dorman petrol engine rated at 45 bhp. The tram car part of the company name was dropped in 1931, so it is presumed there was no tram car part of the business beyond this date.