DR Class 23.10

The steam locomotives of DR Class 23.10, (from 1 June 1970 Class 35.10) were passenger train engines built for the Deutsche Reichsbahn in East Germany after the Second World War.

DR Class 23.10 (35.10)
35 1019-5
Number(s)	New: 23 1001 – 23 1113 1970: 35 1001 – 35 1113
Quantity	113
Year(s) of manufacture	1955–1959
Retired	1991
Wheel arrangement	2-6-2
Axle arrangement	1′C1′ h2
Type	P 35.18
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	22,660 mm (74 ft 4 ^1⁄4 in)
Empty weight	78.5 tonnes (77.3 long tons; 86.5 short tons)
Service weight	87.2 tonnes (85.8 long tons; 96.1 short tons)
Adhesive weight	54.7 tonnes (53.8 long tons; 60.3 short tons)
Axle load	18.3 tonnes (18.0 long tons; 20.2 short tons)
Top speed	Forwards: 110 km/h (68 mph) Reverse: 50 km/h (31 mph)
Indicated Power	1,250 kW (1,700 PS; 1,680 hp)
Driving wheel diameter	1,750 mm (5 ft 8 ^7⁄8 in)
Leading wheel diameter	1,000 mm (3 ft 3 ^3⁄8 in)
Trailing wheel diameter	1,250 mm (4 ft 1 ^1⁄4 in)
No. of cylinders	Two, outside
Cylinder bore	550 mm (21 ^5⁄8 in)
Piston stroke	660 mm (26 in)
Boiler Overpressure	16 bar (1.60 MPa; 232 psi)
No. of heating tubes	150
No. of smoke tubes	38
Heating tube length	4,200 mm (13 ft 9 ^1⁄4 in)
Grate area	3.71 square metres (39.9 sq ft)
Superheater area	68.50 m^2 (737.3 sq ft)
Evaporative heating area	159.60 m^2 (1,717.9 sq ft)
Tender	2′2′ T28
Water capacity	28 m^3 (990 cu ft) or 28,000 litres (6,200 imp gal; 7,400 US gal)
Fuel	Coal: 10 tonnes (9.8 long tons; 11 short tons)

History

35 1097-1 in Dresden in 1999

The Class 23.10 was an evolutionary development by the DR of the DRG Class 23 standard locomotives or Einheitsdampflokomotiven built earlier by the Deutsche Reichsbahn-Gesellschaft. Only two of the latter were completed due to the onset of the war. The same dimensions were used for the driving and running gear, but the locomotives were given IfS/DR mixer-preheaters, boilers equipped with combustion chambers and a large driver's cab. The feedwater dome was omitted from locomotives numbered 23 1003 and later. The first of 113 units was deployed in 1955, and they were used for light to medium express train services, being allocated numbers 23 1001–1113.

With the introduction of EDP numbering on 1 January 1970, all locomotives were re-numbered to 35 1001–1113.

The last engines were retired from Nossen in May 1977, number 35 1113 however had to be reactivated due to the energy crisis and continued in service until 1985.

The locomotives were equipped with tenders of Class 2'2' T 28.

Preserved locomotives

Remaining locomotives of this class today include:

• 35 1019 Lausitzer Dampflokclub Cottbus, operational
• 35 1021 Eisenbahn & Technik Museum Rügen, Prora
• 35 1028 in pieces, Röbel/Müritz
• 35 1074 in pieces, Görlitz
• 35 1097 private, at IG 58 3047 Glauchau, operational
• 35 1113 DB Museum, stored at IG Dampflok Nossen

See also

• List of East German Deutsche Reichsbahn locomotives and railbuses
• Neubaulok
• DB Class 23

Literature

• Ebel, J.U.; Stange, A.; Schlegel, D. (2003). Die Baureihe 23.10 (in German). Freiburg: EK-Verlag. ISBN 978-3-88255-123-5.