NSB type 31b No. 452, built 1926 by Hamar & Thune as part of a series of 27 units for Bergensbanen, delivered 1915 to 1926, derived from the earlier 26 series. Four cylinder compound engine, 2'Dh4v+2'2', weighing 123 t in service and reaching a speed of 70 km/h forward / 50 km/h backward. It remained in service until 1970. Norsk jernbanemuseum, Hamar, 2023-07-18.

tobias b köhler