DRG Class 04

DRG Class 04/02.1
Type and origin Builder Krupp Build date 1932 Total produced 2
Specifications Configuration: ​  • Whyte 4-6-2  • UIC 2'C1'  • 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 buffers 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) Tender type 2'2 T 32 Water cap. 32.0 m3 (1,130 cu ft) Firebox: ​  • Grate area 4.10 m2 (44.1 sq ft) Boiler pressure 25 bar (2,500 kPa; 360 psi) Heating surface: ​  • Tubes 84.60 m2 (910.6 sq ft) Superheater: ​  • Heating area 206.80 m2 (2,226.0 sq ft) Cylinders 4 Cylinder size 2×350 mm (13.78 in)/520 mm (20.47 in) Piston stroke 660 mm (25.98 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

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

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 vehicles, built by the firm of Krupp, soon showed signs of damage on the firebox however. Because the engines did not meet expectations even after modification and repairs, in 1935 the pressure was reduced to 156.9 N/cm² (227.6 psi) again and they were given operating numbers 02 101 and 02 102. Due to a lack of water the boiler on 02 101 exploded on 3 April 1939; after that both engines were retired and eventually scrapped in 1940.

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

See also

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