Mecklenburg III

The Grand Duchy of Mecklenburg Friedrich-Franz Railway grouped early, 2-4-0, passenger train locomotives from the Friedrich-Franz Railway into its Class III.

Mecklenburg III
MFFE No. 19 ZWEIHUNDERT (Sächsische Maschinenfabrik 200 of 1864)
Number(s)	MFFE: 12–19, 20–23, 24–30
Quantity	19
Manufacturer	Sächsische Maschinenfabrik
Year(s) of manufacture	1864 (8), 1866 (4), 1869 (7)
Retired	1901–1910
Wheel arrangement	2-4-0
Axle arrangement	1B n2
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	13,750 mm (45 ft 1 ^1⁄4 in)
Height	4,125 mm (13 ft 6 ^3⁄8 in)
Overall wheelbase	4,395 mm (14 ft 5 in)
Wheelbase incl. tender	9,989 mm (32 ft 9 ^1⁄4 in)
Empty weight	31.30 t (30.81 long tons; 34.50 short tons)
Service weight	33.90 t (33.36 long tons; 37.37 short tons)
Adhesive weight	22.80 t (22.44 long tons; 25.13 short tons)
Axle load	11.40 t (11.22 long tons; 12.57 short tons)
Top speed	90 km/h (56 mph)
Coupled wheel diameter	1,870 mm (6 ft 1 ^1⁄2 in)
Leading wheel diameter	1,065 mm (3 ft 6 in)
Valve gear	Stephenson
No. of cylinders	Two
Cylinder bore	407 mm (16 in)
Piston stroke	560 mm (22 ^1⁄16 in)
Boiler Overpressure	1864 batch: 7.5 kgf/cm^2 (735 kPa; 107 lbf/in^2) 1866 batch: 8.2 kgf/cm^2 (804 kPa; 117 lbf/in^2) 1869 batch:8.9 kgf/cm^2 (873 kPa; 127 lbf/in^2)
No. of heating tubes	188
Heating tube length	1864/66 batches: 3,111 mm (10 ft 2 ^1⁄2 in) 1869 batch: 3,311 mm (10 ft 10 ^1⁄4 in)
Grate area	1.25 m^2 (13.5 sq ft)
Radiative heating area	7.78 m^2 (83.7 sq ft)
Tube heating area	1864/66 batches: 71.64 m^2 (771.1 sq ft) 1869 batch: 77.62 m^2 (835.5 sq ft)
Evaporative heating area	1864/66 batches: 79.42 m^2 (854.9 sq ft) 1869 batch: 84.40 m^2 (908.5 sq ft)
Brakes	Schleifer compressed air brake

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 2-2-2 locomotives of what later became classes I and II were not powerful enough.

To that end the Friedrich-Franz Railway bought 19 2-4-0 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.

See also

• Grand Duchy of Mecklenburg Friedrich-Franz Railway
• List of Mecklenburg locomotives

Sources

• Hans-Joachim Kirsche; Hermann Lohr; Georg Thielmann (1989), Lokomotiv-Archiv Mecklenburg/Oldenburg (in German), Berlin: transpress, ISBN 3-344-00326-7