DRG Class 02

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DRG Class 02
02 008 in June 1932
Number(s)	DRG 02 001 to 02 010
Quantity	10
Manufacturer	Henschel, Maffei
Year(s) of manufacture	1925–1926
Retired	1937 to 1942 (Rebuild into Class 01)
Wheel arrangement	4-6-2
Axle arrangement	2′C1′ h4v
Type	S 36.20
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Length over buffers	23.750 m (77 ft 11 in)
Height	4.650 m (15 ft 3 in)
Wheelbase	12.400 m (40 ft 8 in)
Wheelbase incl. tender	20.320 m (66 ft 8 in)
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)
Adhesive weight	60.3 tonnes (59.3 long tons; 66.5 short tons)
Top speed	fwds: 130 km/h (81 mph) bwds: 50 km/h (31 mph)
Indicated Power	2,300 PS (1,690 kW; 2,270 hp)
Driving wheel diameter	2,000 mm (78.74 in)
Leading wheel diameter	850 mm (33.46 in)
Trailing wheel diameter	1,250 mm (49.21 in)
No. of cylinders	Four (compound): two high pressure (HP), two low pressure (LP)
LP cylinder bore	720 mm (28.35 in)
HP cylinder bore	460 mm (18.11 in)
Piston stroke	660 mm (25.98 in)
Boiler Overpressure	16 bar (1.60 MPa; 232 psi)
No. of heating tubes	129
No. of smoke tubes	43
Heating tube length	001–009: 5,800 mm (19 ft 0.3 in) 010: 6,800 mm (22 ft 3.7 in)
Grate area	4.41 m2 (47.5 sq ft)
Radiative heating area	17.0 m2 (183 sq ft)
Tube heating area	220.56 m2 (2,374.1 sq ft)
Superheater area	100.0 m2 (1,076 sq ft)
Evaporative heating area	237.56 m2 (2,557.1 sq ft)
Tender	2'2 T 32 (2'2 T 30)
Water capacity	32,000 or 30,000 litres (7,040 or 6,600 imp gal; 8,450 or 7,930 US gal)
Fuel	10.0 tonnes (9.8 long tons; 11.0 short tons) coal
Brakes	Knorr single-chamber, compressed air brakes, operating on front of all coupled wheels
Auxiliary brake	yes
Train heating	Steam
Train control	Walschaerts (Heusinger)
Features	originally Wagner smoke deflectors, smaller type

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 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[]

• List of DRG locomotives and railbuses

Literature[]

• Maidment, David (2017). The German Pacific Locomotive: Its Design and Development. Locomotive Portfolios series. Barnsley, South Yorkshire, UK: Pen & Sword Transport. ISBN 9781473852495.
• Deutsche Eisenbahnen (in German). Weltbild Verlag.^{[full citation needed]}
• Weisbrod, Manfred; Petznick, Wolfgang. Baureihe 01 (in German). Transpress Verlag.^{[full citation needed]}
• Großes Lok-Portrait 01.05 (in German). Freiburg: EK Verlag.^{[full citation needed]}
• Koschinski, Konrad (2006). Legendäre Baureihe 01. Eisenbahn-Journal (in German) (Sonderausgabe 2006,2 ed.). Verlagsgruppe Bahn. ISBN 3-89610-156-0.
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 36–38. ISBN 3-87094-081-6.

External links[]

• Photos of locomotive 02 003