Mecklenburg XVIII

The Grand Duchy of Mecklenburg Friedrich-Franz Railway (Großherzoglich Mecklenburgische Friedrich-Franz-Eisenbahn) grouped two, narrow gauge, steam locomotives taken over from the Doberan-Heiligendamm railway (Doberan-Heiligendammer Eisenbahn or DHE) into the Mecklenburg XVIII engine class.

Mecklenburg XVIII
No. 2 around 1890
Number(s)D.H.E. 1 and 2
M.F.F.E 1001 and 1002
Quantity2
ManufacturerHohenzollern AG Düsseldorf-Grafenberg
Year(s) of manufacture1886 + 1887
Retired1916
Wheel arrangement0-4-0T
Axle arrangementB n2t
Track gauge900 mm (2 ft 11 7⁄16 in)
Length over couplers4,000 mm (13 ft 1 1⁄2 in)
Height2,950 mm (9 ft 8 in)
Overall wheelbase1,250 mm (4 ft 1 1⁄4 in)
Empty weight7.50 t / 8.50 t
Service weight8.50 t / 9.50 t
Adhesive weight8.50 t / 9.50 t
Axle load4.25 t / 4.75 t
Top speed35 km/h (22 mph), later 31 km/h (19 mph)
Coupled wheel diameter800 mm (2 ft 7 1⁄2 in)
Valve gearJoy
Cylinder bore200 mm (7 7⁄8 in) / 220 mm (8 11⁄16 in)
Piston stroke350 mm (13 3⁄4 in)
Boiler Overpressure12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
No. of heating tubes78 / 37
Heating tube length1,350 mm (4 ft 5 1⁄4 in)
Grate area0.36 m2 (3.9 sq ft)
Radiative heating area2.15 m2 (23.1 sq ft)
Tube heating area11.25 m2 (121.1 sq ft) / 13.28 m2 (142.9 sq ft)
Evaporative heating area13.40 m2 (144.2 sq ft) / 15.43 m2 (166.1 sq ft)
Water capacity0.75 m3 (160 imp gal; 200 US gal) / 0.69 m3 (150 imp gal; 180 US gal)
Fuel160 kg (350 lb) coal
Locomotive brakesHand brake
Train brakesHeberlein

History

For the opening of the 6.6 km (4.1 mi) long railway line from Doberan to Heiligendamm the DHE had procured two 'tramway' locomotives, which were given the numbers 1 and 2. The long section through the town in Doberan in particular made the procurement of such engines sensible. When the private railways were nationalised in 1890 the locomotives were renumbered to 1001 and 1002. Not long afterwards, it became clear that the locomotives were not able to cope with the rising levels of traffic as they could only haul a three-coach train. So in 1891 and 1898 Class XIX engines were procured. The tramway locos were retired in 1916.

Design Details

The locomotives were designed as box frame engines (Kastenlokomotiven) and had an outside plate frame with a well tank. The two saturated steam engines were on the inside, and the diagonally-oriented cylinders drove the rear coupled axle. The entire running gear was covered. Suspension was provided by leaf springs over the axle boxes. The boiler was horizontal. The firehole was located on the right hand side. In order to keep the minimise the impact when driving through Doberan, exhaust steam was expelled through a condenser. The footplate was located on the right hand side and could be used for driving both forwards and backwards due to the good visibility it afforded. Reversing the Joy valve gear was achieved using a lever working a crossed eccentric rod.

See also

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