Mecklenburg III
The Grand Duchy of Mecklenburg Friedrich-Franz Railway grouped early, , passenger train locomotives from the Friedrich-Franz Railway into its Class III. History. When the Güstrow-Neubrandenburg line went into service, it was essential that locomotives were procured that could cope with the inclines in Mecklenburg Switzerland without difficulty. The existing locomotives of what later became classes I and II were not powerful enough. To that end the Friedrich-Franz Railway bought 19 locomotives from Richard Hartmann in Chemnitz in 3 batches in the years 1864, 1866 and 1869. The locomotives were named after north German towns. Two  engines were given the names "ZWEIHUNDERT" ("two hundred") and "VIER HUNDERT" ("four hundred") based on their factory numbers. The locomotives remained in service until after the turn of the 20th century and were retired between 1903 and 1911. Technical description. The locomotives had an inside forked frame. The boiler barrel had three shells. On the centre one there was a large steam dome, which was as tall as the short cylindrical smokestack. The steam dome was decorated with brass bands. The vertical boiler had a safety valve on top. The twin-cylinder wet steam engine was on the outside. The  steam chests and the Stephenson valve gear were on the inside. The cylinders, which were set horizontally, drove the first coupled axle. The coupled axles had overhung springing using leaf springs. An equalising beam, level with the axle boxes, linked the two springs. On the final batch of 1869 the springs were located underneath the axle boxes of the coupled wheels. On the carrying axle the springs were above the frame. The locomotives had a "Schleifer" compressed air brake. The sandboxes were in front of the first driving axle and sanded the wheels from in front. The engines were equipped  with tenders of class 3T 7.9.