The NMBS/SNCB Type 12 was a class of 4-4-2 steam locomotives built in 1938–1939 for the fast lightweight Ostend boat trains operated by the National Railway Company of Belgium.

The class was designed by engineer Raoul Notesse, based on the Canadian Pacific Railway's successful 4-4-4 "Jubilee" semi-streamlined locomotives of 1936/7, but also incorporated the ideas on streamlining of André Huet.

[3] The class was designed for the fast, relatively lightweight, boat trains on the 124 km (77 mi) journey between Brussels and Ostend to be capable of speeds of 120–140 km/h (75–87 mph).

However, on 12 June 1939 one type 12 locomotive completed the 105 km (65 mi) from Brussels to Ostend in 57 minutes at a maximum speed of 165 km/h (103 mph).

12.004 had been preserved by SNCB and was brought back to running order for the 150th anniversary of railways in Belgium in 1985 but was subsequently left exposed to the elements.