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The Oldenburg Class T 5.1 was a German steam locomotive built for the Grand Duchy of Oldenburg State Railways as a tank engine for passenger train duties. Its design was based on that of the Prussian T 5.1.

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Oldenburg T 5.1 DRG Class 71.4
Type and origin Builder Hanomag Build date 1907–1921 Total produced 20
Specifications Configuration: ​  • Whyte 2-4-2T Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 1,000 mm (3 ft 3+3⁄8 in) Driver dia. 1,600 mm (5 ft 3 in) Trailing dia. 1,000 mm (3 ft 3+3⁄8 in) Wheelbase:  • Overall 6,800 mm (22 ft 3+3⁄4 in) 7,000 mm (22 ft 11+1⁄2 in)* Length: ​  • Over beams 11,685 mm (38 ft 4 in) Axle load 15.0 t (14.8 long tons; 16.5 short tons) Adhesive weight 30.00 t (29.53 long tons; 33.07 short tons) Empty weight 41.50 t (40.84 long tons; 45.75 short tons) Service weight 53.10 t (52.26 long tons; 58.53 short tons) Boiler pressure 12 kgf/cm2 (1.18 MPa; 171 lbf/in2) Heating surface:  • Firebox 1.56 m2 (16.8 sq ft)  • Evaporative 100.68 m2 (1,083.7 sq ft) Cylinders 2 Cylinder size 430 mm (16+15⁄16 in) Piston stroke 600 mm (23+5⁄8 in)
Performance figures Maximum speed 75 km/h (47 mph)
Career Numbers GOE: 185–187, 207–208, 216–218, 226–228, 236, 256–258, 269–271, 279–280 DRG: 71 401 – 71 420 Retired 1930
* from 1911

The firm of Hanomag manufactured 20 units of the Oldenburg T 5.1 between 1907 and 1921. Like its Prussian sisters it had the defect of poor riding qualities at high speeds. As a result, during the delivery of these engines design changes were made to the running gear, for example the overall wheelbase was increased. But even these measures met with no success.

The Deutsche Reichsbahn took over all 20 locomotives in 1925 as DRG Class 71.4 and gave them numbers 71 401 to 71 420. They were retired by 1930.

See also

• Grand Duchy of Oldenburg State Railways
• List of Oldenburg locomotives and railbuses
• Länderbahnen

References

• Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 76–77. ISBN 978-3-946594-21-5.
• Spielhoff, Lothar (1990). Länderbahn-Dampf-Lokomotiven. Band 1: Preußen, Mecklenburg, Oldenburg, Sachsen und Elsaß-Lothringen (in German). Stuttgart: Franckh'sche Verlagshandlung. ISBN 3-440-06145-0.^{[page needed]}
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 60–96 (EFA 1.3) (in German) (4th ed.). Düsseldorf: Alba. pp. 42–44. ISBN 3-87094-083-2.

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