The Estonian Mõisaküla–Viljandi railway line was opened in 1897. On the 19th of July 1935, a test run was made with a new narrow-gauge diesel railcar. The railcar reached a maximum speed of 85 km/h, and an average speed of 62 km/h, which was considered excellent speed indicators for a narrow-gauge railway in those days. The railcars, painted green, were given the designations DeM 1 and DeM 2. In 1935 the public christened the new railcar the "Mulgi Express".
Interior view of carriage number 502.
