DRG Class 02

The German DRG Class 02 (Baureihe 02 or BR 02) engines were standard (Einheitslokomotiven) express train locomotives with the Deutsche Reichsbahn-Gesellschaft. Number 02 001 was the first Einheitsdampflokomotive in the DRG to be completed.

DRG Class 02
Number(s)DRG 02 001–010
Quantity10
ManufacturerHenschel, Maffei
Year(s) of manufacture1925–1926
Retired1937 to 1942
Rebuild into Class 01, 02 003, (later 01 234):
8 May 1972
Wheel arrangement4-6-2
Axle arrangement2′C1′ h4v
TypeS 36.20
Track gauge1,435 mm (4 ft 8 12 in)
Length over buffers23.750 m (77 ft 11 in)
Height4.650 m (15 ft 3 in)
Wheelbase12.400 m (40 ft 8 in)
Wheelbase incl. tender20.320 m (66 ft 8 in)
Empty weight103.9 tonnes (102.3 long tons; 114.5 short tons)
Service weight113.5 tonnes (111.7 long tons; 125.1 short tons)
Adhesive weight60.3 tonnes (59.3 long tons; 66.5 short tons)
Top speedfwds: 130 km/h (81 mph)
bwds: 50 km/h (31 mph)
Indicated Power2,300 PS (1,690 kW; 2,270 hp)
Driving wheel diameter2,000 mm (78.74 in)
Leading wheel diameter850 mm (33.46 in)
Trailing wheel diameter1,250 mm (49.21 in)
No. of cylindersFour (compound): two high pressure (HP), two low pressure (LP)
LP cylinder bore720 mm (28.35 in)
HP cylinder bore460 mm (18.11 in)
Piston stroke660 mm (25.98 in)
Boiler Overpressure16 bar (1.60 MPa; 232 psi)
No. of heating tubes129
No. of smoke tubes43
Heating tube length001–009: 5,800 mm (19 ft 0.3 in)
010: 6,800 mm (22 ft 3.7 in)
Grate area4.41 m2 (47.5 sq ft)
Radiative heating area17.0 m2 (183 sq ft)
Tube heating area220.56 m2 (2,374.1 sq ft)
Superheater area100.0 m2 (1,076 sq ft)
Evaporative heating area237.56 m2 (2,557.1 sq ft)
Tender2'2 T 32 (2'2 T 30)
Water capacity32,000 or 30,000 litres (7,040 or 6,600 imp gal; 8,450 or 7,930 US gal)
Fuel10.0 tonnes (9.8 long tons; 11.0 short tons) coal
BrakesKnorr single-chamber, compressed air brakes, operating on front of all coupled wheels
Auxiliary brakeyes
Train heatingSteam
Train controlWalschaerts (Heusinger)
Featuresoriginally Wagner smoke deflectors, smaller type

In procuring a standard express train steam locomotive, the Deutsche Reichsbahn carried out a comparison between a superheated two-cylinder type (the DRG Class 01) and a four-cylinder compound locomotive (the Class 02). Ten examples of each type were built from 1925, and the Class 02 vehicles were given operating numbers 02 001 – 02 010. The first eight engines were manufactured in 1925 by the firm of Henschel, two more were built in 1926 by Maffei.

Because the Class 02 steam engines were badly designed, the compound engine could only produce a high level of power at speeds of over 70 km/h. In addition, below 1000 PSi its steam consumption was higher than that of the Class 01.

Compared with the Class 01s, these engines had a complicated, and therefore maintenance-intensive, drive; as a result no more were ordered. From 1937 to 1942 the vehicles were successively converted to two-cylinder operation and regrouped as Class 01s with the new numbers 01 011 and 01 233 – 01 241.

The first eight engines were equipped with 2'2' T 30 tenders; the other two with 2'2 T 32 tenders. Later on, the second tender was coupled to all of the first eight engines as well.

See also

Literature

  • Deutsche Eisenbahnen (in German). Weltbild Verlag.
  • Weisbrod; Petznick. Baureihe 01 (in German). Transpress Verlag.
  • Großes Lok-Portrait 01.05 (in German). Freiburg: EK Verlag.
  • Koschinski, Konrad (2006). Legendäre Baureihe 01. Eisenbahn-Journal (in German) (Sonderausgabe 2006,2 ed.). Verlagsgruppe Bahn. ISBN 3-89610-156-0.
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