DRG Class 02

DRG Class 02
Number(s):	DRG 02 001–010
Quantity:	10
Manufacturer:	Henschel, Maffei
Year(s) of manufacture:	1925–1926
Retired:	1937 to 1942 Rebuild into Class 01, 02 003, (later 01 234): 8 May 1972
Wheel arrangement:	4-6-2
Axle arrangement:	2′C1′ h4v
Type:	S 36.20
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 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, 2 HP, 2 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 engine (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.

Literature

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

See also

• List of DRG locomotives and railbuses

External links

• Photos of locomotive 02 003
• There is a relevant English-language forum at Railways of Germany