Prussian T 3
| Prussian T 3 DRG Class 89.70–75 DR Class 89.62 |
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|---|---|
Preußische T 3
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| Number(s) | DRG 89 7001–7511 |
| Quantity | over 1,300 |
| Manufacturer | Henschel and others |
| Year(s) of manufacture | 1882ff. |
| Retired | 1968 |
| Wheel arrangement | 0-6-0T |
| Axle arrangement | C n2t |
| Type | Gt 33.10 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Length over buffers |
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| Service weight | 28.9–31.9 tonnes (28.4–31.4 long tons; 31.9–35.2 short tons) |
| Adhesive weight | 28.9–31.9 tonnes (28.4–31.4 long tons; 31.9–35.2 short tons) |
| Axle load | 10.0–12.0 tonnes (9.8–11.8 long tons; 11.0–13.2 short tons) |
| Top speed | 40 km/h (25 mph) |
| Indicated Power | 213 kW (290 PS; 286 hp) |
| Driving wheel diameter | 1,100 mm (3 ft 7 1⁄4 in) |
| No. of cylinders | 2 |
| Cylinder bore | 350 mm (13 3⁄4 in) |
| Piston stroke | 550 mm (21 5⁄8 in) |
| Boiler Overpressure | 12 bar (1.20 MPa; 174 psi) |
| Grate area | 1.86 m2 (20.0 sq ft) |
| Evaporative heating area | 55.67 m2 (599.2 sq ft) |
| Water capacity | 5,000 l (1,100 imp gal; 1,300 US gal) |
| Fuel | Coal: 1.9 tonnes (1.9 long tons; 2.1 short tons) |
| Brakes | some with compressed-air brakes |
The Prussian Class T 3 steam locomotives procured for the Prussian state railways were 0-6-0 tank locomotives. Together with the Prussian T 2 they were the first locomotives that were built to railway norms. The first units were delivered by Henschel in 1882.
The T 3s had a wet steam engine with two cylinders that drove the centre coupled axle. The slide valves were worked by an outside Allan valve gear. The water supply was stored in a well tank between the frame under the boiler; the coal bunkers were on the left and right hand side of the firebox. In front of each one was a filler pipe for the water tank.
The springs on both front axles were linked with equalising beams located above the running plate.
The early T 3s did not have a steam dome, but were equipped with a regulator housing on top, from which the admission pipes led directly to the cylinders outside the boiler. The axle load of this locomotive was about 10 t (see first photo).
Later batches (from 1887) had a steam dome, and the admission pipes were located in the smokebox. Due to the addition of the steam dome, the location of the sand box and sanders were changed. In addition the quantities of water and coal that could be carried were increased. The back wall of the cab was now straight and the lower section no longer sloped. The length over buffers increased from 8,300 mm to 8,591 mm, the axle load rose to 11 t (see second photo).
From 1903 the supplies were increased again and the T 3 could now carry 5 m3 of water and 1.9 t of coal. The axle load of this "strengthened standard class" or "Standard class (6t)" (Normalbauart (6t)) was 12 t.
A total of more than 1,300 T 3s were built for the Prussian state railways. But many other railways in Germany and abroad, from industrial railways to national railways, also bought locomotives based on the T 3 pattern, including the:
In 1925 the Deutsche Reichsbahn (DRG) took over 511 Prussian T 3s as their Class 89.70–75. The 473 locomotives of the older version were given numbers 89 7001–7456, 7473–7476 and 7499–7511. The 38 locomotives of the stronger design were given numbers 89 7457–7472 and 89 7477–7498.
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