Steam locos, and a few of the larger diesels were built in the “Drewitz” works, in the Babelsburg suburb of Berlin.
After the arrival of the Russians changed the political landescape somewhat, this works evolved into “Lokomotive Karl Marx” – so no mistaking the political allegiance there.The smaller narrow gauge internal-combustion locos were built at a works in Nordhausen, in the Harz mountains, and were marked under the “Montania” brand – it being the Montania works.
The MRT has three such Montania/William Jones locos in the collection – two petrol locos, types MM and M, and a diesel RL1B.