The DMSu-958 (ДМСу-958, ДМСу = дрезина монтажная скоростная универсальная) is a universal track motor car used for maintenance and construction of the overhead contact system of an electric railway. The DMSu mostly operated on ZIL-130 petrol engines of 110 hp, their speed limit was 80 km/h, and the operating weight was 15 tonnes. The motor car has an insulated platform with a lifting height of 7.75 metres. The vehicle could hold nine people. The track motor car from the 1960s is an exhibit at the Railway and Communications Museum in Haapsalu since March 2, 2017.