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The two German Class 04 steam locomotives were experimental engines with the Deutsche Reichsbahn, that were derived from the Class 03 standard locomotives (Einheitsloks).

DRG Class 04/02.1
04 001 in 1932
Type and origin Builder Krupp Build date 1932 Total produced 2
Specifications Configuration: ​  • Whyte 4-6-2  • German S 36.18 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 1,000 mm (39.37 in) Driver dia. 2,000 mm (78.74 in) Trailing dia. 1,250 mm (49.21 in) Length: ​  • Over beams 23,905 mm (78 ft 5 in) Adhesive weight 59.5 t (58.6 long tons; 65.6 short tons) Service weight 106.3 t (104.6 long tons; 117.2 short tons) Water cap. 32.0 m3 (1,130 cu ft) Boiler pressure 25 bar (2,500 kPa; 360 psi) Heating surface:  • Tubes 84.60 m2 (910.6 sq ft)  • Firebox 4.10 m2 (44.1 sq ft) Superheater: ​  • Heating area 206.80 m2 (2,226.0 sq ft) Cylinders 4 Piston stroke 660 mm (25.98 in) High-pressure cylinder 350 mm (13.78 in) Low-pressure cylinder 520 mm (20.47 in)
Performance figures Maximum speed 140 km/h (87 mph) Indicated power 1,545–1,706 kW (2,072–2,288 hp) (depending on build state)
Career Numbers DRG 02 101–102 Retired 1939

History

In 1932, the Deutsche Reichsbahn tried to raise boiler overpressures from 156.9 to 245.1 N/cm² (227.6 to 355.5 psi) by using high-tensile steel. These engines, built by the firm of Krupp, were initially tested at the Grunewald Locomotive Testing Office. With a specific steam consumption value of 5.2 kg/PSh with respect to their indicated output, the locomotives clearly undercut the very low steam consumption value of the Class 03 by over 1 kg/PSh. The coal consumption based on the effective power at the coupling hook, was 0.96 kg/PSh compared with 1.13 kg/PSh on the 03.[1]

The medium-pressure boilers did not prove to be stable, and after a short time damage occurred to the firebox. Since the locomotives did not meet expectations even after modifications and repairs, the permissible boiler overpressure was finally reduced to 20 atmospheres in 1935 and they were added to the operating portfolio with the company numbers 02 101 and 02 102. They were then intended to be used in regular train service from the Hamburg-Altona depot, but since they had no experience with four-cylinder compound locomotives there, they were handed over to the Hof depot in 1936. Due to a lack of water, the boiler of 02 101 exploded on 3 April 1939,[2] whereupon both engines were decommissioned and were scrapped in 1940.

The engines were equipped with a 2'2' T 32 standard tender.

See also

• List of DRG locomotives and railcars
• List of boiler explosions

References

• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 53–55. ISBN 3-87094-081-6.

На других языках

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[de] DR-Baureihe 04

Die beiden Dampflokomotiven der Baureihe 04 waren Mitteldruck-Versuchslokomotiven der Deutschen Reichsbahn, die aus den Einheitsdampflokomotiven der Baureihe 03 abgeleitet wurden.

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- [en] DRG Class 04

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