Mecklenburg T 7

The Mecklenburg T 7 engines were German, six-coupled, narrow gauge, steam locomotives with the Grand Duchy of Mecklenburg Friedrich-Franz Railway (Großherzoglich Mecklenburgische Friedrich-Franz-Eisenbahn). They were employed on the Bäderbahn between Bad Doberan and Heiligendamm. They replaced the existing vehicles after the line had been extended to 15.4 kilometres to Arendsee. The three engines, which were later given the numbers 99 301 - 99 303 in the 1920s by the Deutsche Reichsbahn, were delivered in 1910, 1911 and 1914. The design of these locomotives was heavily based on those of the Class T 3 from Prussia. Later, two units went to the so-called Rübenbahn ('Turnip Railway'), the branch line from Tangermünde to Lüderitz. No. 99 302 was retired in 1932, the other two were given to the USSR in 1945 as reparations.

Mecklenburg T 7
DRG Class 99.30
Type and origin
BuilderHenschel
Build date1910–14
Total produced3
Specifications
Configuration:
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 • Whyte0-6-0T
 • GermanK.33.6
Gauge900 mm (2 ft 11+7⁄16 in)
Driver dia.700 mm (2 ft 3+1⁄2 in)
Wheelbase:
 • Overall		1,800 mm (5 ft 10+3⁄4 in)
Length:
​
 • Over beams5,650 mm (18 ft 6+1⁄2 in)
Height3,330 mm (10 ft 11+1⁄8 in)
Adhesive weight16.2 t (15.9 long tons; 17.9 short tons)
Empty weight13 t (13 long tons; 14 short tons)
Service weight16.2 t (15.9 long tons; 17.9 short tons)
Fuel capacity750 kg (1,650 lb) coal
Water cap.1.7 m3 (370 imp gal; 450 US gal)
Boiler pressure12 kg/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:
 • Firebox		0.56 m2 (6.0 sq ft)
 • Radiative2.64 m2 (28.4 sq ft)
 • Evaporative30.05 m2 (323.5 sq ft)
Cylinders2
Cylinder size260 mm (10+1⁄4 in)
Piston stroke400 mm (15+3⁄4 in)
Valve gearStephenson
Performance figures
Maximum speed30 km/h (19 mph)
Indicated power125 PS (91.9 kW; 123 hp)
Tractive effort:
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 • Starting22.95 kN (5,160 lbf)
Career
Numbers
  • MFFE: 1005–1007
  • DRG: 99 301 – 99 303
Retired1948

See also

References
    • Obermayer, Horst J. (1971). Taschenbuch Deutsche Schmalspur-Dampflokomotiven (in German). Stuttgart: Franckh. ISBN 3-440-03818-1.
    • Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 141–143. ISBN 3-87094-087-5.
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