| DB Class 50.40 | |
|---|---|
| Number(s): | 50 4001–50 4031 |
| Quantity: | 31 |
| Manufacturer: | Rebuild: Henschel |
| Year(s) of manufacture: | 1955 |
| Retired: | 1967 |
| Axle arrangement: | 1'E h2 |
| Type: | G 56.15 |
| Gauge: | 1,435 mm (4 ft 8 1⁄2 in) |
| Length over buffers: | 22.94 m (75 ft 3 in) |
| Service weight: | 90.6 t (89.2 long tons; 99.9 short tons) |
| Adhesive weight: | 78.4 t (77.2 long tons; 86.4 short tons) |
| Axle load: | 15.4 t (15.2 long tons; 17.0 short tons) |
| Top speed: | 80 km/h (50 mph) (both directions) |
| Indicated Power: | 1,540 psi (10,600 kPa) |
| Coupled wheel diameter: | 1,400 mm (55.12 in) |
| Driving wheel diameter: | 1,400 mm (55.12 in) |
| Leading wheel diameter: | 850 mm (33.46 in) |
| Valve gear: | Walschaerts with lifting links |
| No. of cylinders: | 2 |
| Cylinder bore: | 600 mm (23.62 in) |
| Piston stroke: | 660 mm (25.98 in) |
| Boiler Overpressure: | 16 bar (1,600 kPa; 230 psi) |
| Grate area: | 3.05 m2 (32.8 sq ft) |
| Superheater area: | 48.8 m2 (525 sq ft) |
| Evaporative heating area: | 193.47 m2 (2,082.5 sq ft) |
| Tender: | 2'2' T 26 |
| Train heating: | Steam |
Because the Deutsche Bundesbahn had sufficient goods train locomotives, they could quickly phase out the DRB Class 52 engines, so that the ageing boilers on the Class 50s could be replaced by those of the Class 52s. Even the 'bathtub' tender of the Kriegslokomotiven was used by the 50s amongst others. In the 1950s, several Class 50 locomotives served as trials engines. Thus 35 machines were given a boiler with mixer preheater and turbo feed pumps. Number 50 1503 was experimentally equipped with a Giesl ejector. In 1959 ten locomotives were given a boiler with smaller grate area in order to try to reduce the consumption of coal.
After experience with Franco-Crosti boilers on Class 52 locomotives (DB Class 42.90), Henschel rebuilt number 50 1412 in 1954 with such a boiler. This included a second preheater boiler underneath the actual locomotive boiler itself. After the smoke gases had flowed through the main boiler, they were turned around and passed through the preheater boiler. They escaped into the atmosphere through a side chimney along with the exhaust steam. The feed water was initially heated in a surface or mixer preheater, then in the preheater boiler before entereing the main boiler. Ih this way the heat energy of the combustion gases could be better utilised and fuel consumption reduced. In 1958, 30 more engines were given Franco-Crosti smoke gas preheaters. These locos were redesignated as 50 4001 to 50 4031. Number 50 4011 was given oil firing. It was deployed in Münsterland and in the Rhineland. The locomotives were retired by 1967.
Read more about this topic: DRB Class 50
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