It was built by Nykvist & Holm (NOHAB) in 1961–1963, and equipped with Electro-Motive Diesel engines.

They remain in service as shunters for private railway companies.

The T43 made it possible to phase out steam locomotives in Sweden, with none left in service there after 1963.

Until the mid-1980s the T43 was used on main-line services, both for passenger and freight trains.

The main area of passenger service was on Blekingekustbanan.