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DRG Class 02
02 008 in June 1932
Type and origin
Power type
Steam
Builder
Henschel & Sohn (8)
Maffei (2)
Serial number
Henschel 20460–20467
Maffei 5621–5622
Build date
1925–1926
Total produced
10
Specifications
Configuration:
• Whyte
4-6-2
• UIC
2′C1′ h4v
• German
S 36.20
Driver
2nd coupled axle for all cylinders
Gauge
1,435 mm (4 ft 8+1⁄2 in)
Leading dia.
0,850 mm (33+1⁄2 in)
Driver dia.
2,000 mm (78+3⁄4 in)
Trailing dia.
1,250 mm (49+1⁄4 in)
Wheelbase:
• Axle spacing (Asymmetrical)
2,200 mm (7 ft 2+5⁄8 in) +
1,800 mm (5 ft 10+7⁄8 in) +
2,300 mm (7 ft 6+1⁄2 in) +
2,300 mm (7 ft 6+1⁄2 in) +
3,800 mm (12 ft 5+5⁄8 in)
• incl. tender
20,320 mm (66 ft 8 in)
Length:
• Over buffers
23,750 mm (77 ft 11 in)
Height
4.550 m (14 ft 11+1⁄8 in)
Axle load
20.1 tonnes (19.8 long tons; 22.2 short tons)
Adhesive weight
60.3 tonnes (59.3 long tons; 66.5 short tons)
Empty weight
103.9 tonnes (102.3 long tons; 114.5 short tons)
Service weight
113.5 tonnes (111.7 long tons; 125.1 short tons)
Tender type
2′2 T 32 (2′2 T 30)
Fuel type
Coal
Fuel capacity
10.0 tonnes (9.8 long tons; 11.0 short tons)
Water cap.
32 or 30 m3 (7,040 or 6,600 imp gal; 8,450 or 7,930 US gal)
Firebox:
• Grate area
4.41 m2 (47.5 sq ft)
Boiler:
• Pitch
3,100 mm (10 ft 2 in)
• Tube plates
5,800 mm (19 ft 3⁄8 in)
• Small tubes
54 mm (2+1⁄8 in), 129 off
• Large tubes
143 mm (5+5⁄8 in), 43 off
Boiler pressure
16 bar (16.3 kgf/cm2; 232 psi)
Heating surface:
• Firebox
17.0 m2 (183 sq ft)
• Tubes
115.18 m2 (1,239.8 sq ft)
• Flues
105.38 m2 (1,134.3 sq ft)
• Total surface
237.56 m2 (2,557.1 sq ft)
Superheater:
• Heating area
100.0 m2 (1,076 sq ft)
Cylinders
Four (compound): two high-pressure (HP) inside, two low-pressure (LP) outside
High-pressure cylinder
460 mm × 660 mm (18+1⁄8 in × 26 in)
Low-pressure cylinder
720 mm × 660 mm (28+3⁄8 in × 26 in)
Valve gear
Walschaerts (Heusinger)
Train heating
Steam
Loco brake
Knorr single-chamber, compressed air brakes, operating on front of all coupled wheels
Performance figures
Maximum speed
fwds: 130 km/h (81 mph)
bwds: 50 km/h (31 mph)
Indicated power
2,300 PS (1,690 kW; 2,270 hp)
Career
Numbers
DRG 02 001 to 02 010
Disposition
Rebuilt to DRG Class 01 (1937–1942)
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.
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 100 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 simple operation and regrouped as Class 01s with the new numbers 01 011 and 01 233 to 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.
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