Prussian T 9

Prussian T 9.1 DRG Class 90.0–2
Prussian T9.1 7270 Cöln at Bochum-Dahlhausen Railway Museum
Number(s)	DRG 90 001–252
Quantity	426
Year(s) of manufacture	1892–1901
Retired	1953
Wheel arrangement	0-6-2T
Axle arrangement	C1′
Length over buffers	11,320 mm (37 ft 1 ³⁄₄ in)
Service weight	54.5 tonnes (53.6 long tons; 60.1 short tons)
Adhesive weight	41.5 tonnes (40.8 long tons; 45.7 short tons)
Axle load	14.2 tonnes (14.0 long tons; 15.7 short tons)
Top speed	60 km/h (37 mph)
Indicated Power	331 kW (450 PS; 444 hp)
Driving wheel diameter	1,350 mm (4 ft 5 ¹⁄₈ in)
Trailing wheel diameter	1,000 mm (39 ³⁄₈ in)
Cylinder bore	430 mm (16 ¹⁵⁄₁₆ in)
Piston stroke	630 mm (24 ¹³⁄₁₆ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Tube heating area	1.53 m² (16.5 sq ft)
Evaporative heating area	107.76 m² (1,159.9 sq ft)

Prussian T 9 – Elberfeld variant
Number(s)	DRG 90 116
Quantity	37
Manufacturer	Henschel, Krauss
Year(s) of manufacture	1891–1900
Retired	1931
Wheel arrangement	0-6-2T
Axle arrangement	C1′
Track gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Length over buffers	10,470 mm (34 ft 4 ¹⁄₄ in)
Service weight	48.1 tonnes (47.3 long tons; 53.0 short tons)
Adhesive weight	39.5 tonnes (38.9 long tons; 43.5 short tons)
Axle load	13.75 tonnes (13.53 long tons; 15.16 short tons)
Top speed	45 km/h (28 mph)
Driving wheel diameter	1,080 mm (3 ft 6 ¹⁄₂ in)
Trailing wheel diameter	810 mm (2 ft 7 ⁷⁄₈ in)
Cylinder bore	400 mm (15 ³⁄₄ in)
Piston stroke	500 mm (19 ¹¹⁄₁₆ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Superheater area	1.71 m² (18.4 sq ft)
Evaporative heating area	110.3 m² (1,187 sq ft)

Prussian T 9 – Langenschwalbach variant
Number(s)	DRG 90 232–233
Quantity	19
Manufacturer	Esslingen, Schwartzkopff
Year(s) of manufacture	1892–1895
Retired	1930
Wheel arrangement	0-6-2T
Axle arrangement	C1′
Track gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Length over buffers	10,380 mm (34 ft ³⁄₄ in)
Service weight	53.8 tonnes (53.0 long tons; 59.3 short tons)
Adhesive weight	43.8 tonnes (43.1 long tons; 48.3 short tons)
Axle load	13.9 tonnes (13.7 long tons; 15.3 short tons)
Top speed	50 km/h (31 mph)
Driving wheel diameter	1,250 mm (4 ft 1 ¹⁄₄ in)
Trailing wheel diameter	810 mm (2 ft 7 ⁷⁄₈ in)
Cylinder bore	450 mm (17 ¹¹⁄₁₆ in)
Piston stroke	630 mm (24 ¹³⁄₁₆ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Tube heating area	1.73 m² (18.6 sq ft)
Evaporative heating area	135.80 m² (1,461.7 sq ft)
Brakes	Counterweight, Heberlein, Riggenbach, Westinghouse

Prussian T 9 – Upper Hessian Railway Company
Quantity	1
Manufacturer	Krauss
Year(s) of manufacture	1895
Axle arrangement	C1′
Track gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Service weight	51 tonnes (50 long tons; 56 short tons)
Adhesive weight	42 tonnes (41 long tons; 46 short tons)
Top speed	60 km/h (37 mph)
Driving wheel diameter	1,210 mm (3 ft 11 ⁵⁄₈ in)
Cylinder bore	440 mm (17 ⁵⁄₁₆ in)
Piston stroke	600 mm (23 ⁵⁄₈ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Grate area	1.6 m² (17 sq ft)
Evaporative heating area	103.9 m² (1,118 sq ft)

Prussian T 9.2 DRG Class 91.0–1
DR 91 134 in Potsdam (1993)
Number(s)	DRG 91 001–121 DRG 91 131–149
Quantity	235
Year(s) of manufacture	1892–1900
Retired	1966
Axle arrangement	1′C
Track gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Length over buffers	10,650 mm (34 ft 11 ¹⁄₄ in)
Service weight	52.6 tonnes (51.8 long tons; 58.0 short tons)
Adhesive weight	41.0 tonnes (40.4 long tons; 45.2 short tons)
Axle load	14.7 tonnes (14.5 long tons; 16.2 short tons)
Top speed	60 km/h (37 mph)
Indicated Power	338 kW (460 PS; 453 hp)
Driving wheel diameter	1,350 mm (4 ft 5 ¹⁄₈ in)
Leading wheel diameter	1,000 mm (3 ft 3 ³⁄₈ in)
Cylinder bore	430 mm (16 ¹⁵⁄₁₆ in)
Piston stroke	630 mm (24 ¹³⁄₁₆ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Tube heating area	1.75 m² (18.8 sq ft)
Evaporative heating area	106.82 m² (1,149.8 sq ft)

Prussian T 9.3 DRG Class 91.3–18, 91.20 ÖBB 691, PKP Class TKi 3

Number(s)	DRG 91 303–1836 DRG 91 2001–2010
Quantity	2,060
Year(s) of manufacture	1900ff.
Retired	1971
Axle arrangement	1′C
Track gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Length over buffers	10,700 mm (35 ft 1 ¹⁄₄ in)
Service weight	46.1 tonnes (45.4 long tons; 50.8 short tons)
Adhesive weight	36.1 tonnes (35.5 long tons; 39.8 short tons)
Axle load	15.6 tonnes (15.4 long tons; 17.2 short tons)
Top speed	65 km/h (40 mph)
Indicated Power	346 kW (470 PS; 464 hp)
Driving wheel diameter	1,350 mm (4 ft 5 ¹⁄₈ in)
Leading wheel diameter	1,000 mm (3 ft 3 ³⁄₈ in)
Cylinder bore	450 mm (17 ¹¹⁄₁₆ in)
Piston stroke	630 mm (24 ¹³⁄₁₆ in)
Boiler Overpressure	12 bar (1.20 MPa; 174 psi)
Grate area	1.50 m² (16.1 sq ft)
Evaporative heating area	103.66 m² (1,115.8 sq ft)

The Prussian T 9 was a class of German steam locomotive which included several types of tank engine, all with six coupled wheels and two carrying wheels operated by the Prussian state railways.

Class T 9.1 of the Prussian state railways were goods train tank locomotives with a 0-6-2T wheel arrangement. They were intended for service on branch lines, for goods train duties on main lines and for shunting (rail) work. A total of 420 locomotives were built by various manufacturers for the Prussian state railways as well as 6 units for the Cronberg Railway, which had been taken over by the state railways in 1914.

In 1923 they were included by the Deutsche Reichsbahn as DRG Class 90.0-2 in their initial numbering plan with running numbers 90 001 to 90 328. In 1925 the final plan recorded locomotives with the numbers 90 001 - 021, 90 024 - 90 115, 90 117 - 122 and 90 125 - 231 as well as the incorrectly designated Class 91 group with the numbers 91 088, 91 089, 91 109 - 114 and 91 301 and 302. They were joined later by 90 234 from the Bremen harbour railway, 90 235 - 237 from the Saar Railway and 90 241 - 245 from the Lübeck-Büchen Railway, that had ordered six new T 9.1 engines in 1900 and 1903, and later bought four more, second-hand, locomotives from the Prussian state railways.

Several examples of this engine were handed over to foreign railway administrations and some of them later returned to the Deutsche Reichsbahn fleet during the Second World War as 90 246 - 251.

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