Statens Järnvägar T21 90, one of 54 built 1955 to 1958 by MaK and ASJ. Maximum speed 80 km/h, power 590 kW. It was derived from the German type MaK 800 D and used on Nynäsbanan 1958 to 1962, afterwards for shunting and freight trains to Jordbro. The last went out of service in the 1990s.
Nynäshamns Järnvägsmuseum, 2023-07-30.