BR class D16 / 2
| BR class D16 / 2 | |
|---|---|
 |
|
| Numbering: | 10201-10203 |
| Number: | 3 |
| Manufacturer: | Ashford Works, Brighton Works, English Electric |
| Year of construction (s): | 1950, 1954 * |
| Retirement: | 1963 |
| Axis formula : | (1Co) (Co1) |
| Type : | Express locomotive |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 19,431 mm |
| Height: | 3988 mm |
| Width: | 2449 mm |
| Trunnion Distance: | 8687 mm (pivot points, since there are no pins) |
| Bogie axle base: | 2438 mm, 1676 mm to the running axles |
| Fixed wheelbase: | 4877 mm |
| Total wheelbase: | 16,916 mm |
| Service mass: | 137 t, 135 t * |
| Wheel set mass : | 18.75 t, 18.6 t * |
| Top speed: | 177 km / h, 145 km / h * |
| Installed capacity: | 1305 kW (1,774 hp), 1,491 kW (2,028 hp) * |
| Starting tractive effort: | 214 kN, 222 kN * |
| Driving wheel diameter: | 1092 mm |
| Impeller diameter: | 940 mm |
| Motor type: | English-Electric 16SVT MkI, MkII * |
| Motor type: | Four-stroke - Diesel - Sixteen-cylinder engine |
| Rated speed: | 750 rpm |
| Power transmission: | electric |
| Number of traction motors: | 6 DC motors |
| Drive: | diesel-electric |
| Train heating: | steam |
| * Dimensions for 10203 | |
The BR-Class D16 / 2 were two diesel-electric test locomotives for the express train service of British Railways , which had been commissioned by the predecessor company Southern Railway . British Rail had a third, improved machine built in 1954.
history
Oliver Bulleid , the chief engineer of Southern Railways, designed this bogie locomotive for high-quality passenger train traffic. The nationalization of the company on January 1, 1948 under the Transport Act 1947 took place before the locomotives were completed. Nevertheless, the constructive handwriting of Bulleid is clearly recognizable, as the machines with their clear box shape showed more similarity to his electric locomotives ( SR class CC ) than to diesel machines such as those usually built by English Electric (e.g. BR class D16 / 1 , BR class 40 ). Initially, the machines were mainly used for express trains from London Waterloo Station to Bournemouth / Weymouth and Exeter . The well-documented tests published by Oswald Stevens Nock were also carried out on the latter relation . The experiments were carried out in two stages. On the one hand, "analytical" test drives with a so-called dynamometer car between Salisbury and Exeter under controlled, comparable conditions in order to determine the fuel consumption in relation to the traction performance, as well as to obtain comparative curves to previously performed steam locomotive tests. The tests were carried out with different gear ratios . Taking into account the current fuel prices at the time, Nock comes to the conclusion that the machines have no economic advantages in terms of fuel consumption compared to a steam locomotive with a contemporary design ("... no appreciable cash saving over steam ..."). The other "test series" took place with regular trains between Waterloo and Exeter, in which normal train journeys with all their unpredictable deviations from the plan were recorded and evaluated. This resulted in Nock's judgment that this diesel locomotive was suitable for sustained high-speed travel in front of relatively light trains ("... the run shows how very suitable these Southern diesels are for sustained high-speed running with relatively light trains.").
The construction of the third locomotive, with an improved engine and changed gear ratios, expanded the possible uses of the construction, so that freight trains were also added to the scope of duties. On behalf of the British Transport Commission (BTC), the Swindon Experimental and Locomotive Testing Station also subjected this machine to tests based on the same model as its sister machine 10202 three years earlier.
The paintwork probably changed over time. On the one hand there is an undated picture with a black locomotive body and a silver roof. On the other hand, there are recordings that clearly show a green color scheme. The aging processes of the color film material of that time do not always allow a clear assignment to the two color variants today.
The engine of the 10203 and the bogie construction were taken over unchanged in the construction of the first ten series machines of the BR series 40. The trunnion-free design of the bogies of the prototype machines was also implemented again in the Class 40.
Due to their status as prototype or pre-series machines , the supply of spare parts became more and more complicated over time and the locomotives were consequently taken out of service in 1963. For a long time they were stored in the Derby Works and in 1968 all three copies were finally scrapped.
literature
- OS Nock: Performance and Efficiency Tests on SR Diesel Electric Locomotive. No.I . In: The Engineer . tape 196 , 2nd October. London 1953, p. 424-427 ( gracesguide.co.uk [PDF]).
- OS Nock: Performance and Efficiency Tests on SR Diesel Electric Locomotive. No.II . In: The Engineer . tape 196 , 9th October. London 1953, p. 451-453 ( gracesguide.co.uk [PDF]).
- OS Nock: Performance of 2,000 HP Main-Line Diesel-Electric Locomotive. No.I . In: The Engineer . tape 201 , 25th May. London 1956, pp. 550-553 ( gracesguide.co.uk [PDF]).
- OS Nock: Performance of 2,000 HP Main-Line Diesel-Electric Locomotive. No.II . In: The Engineer . tape 201 , 1st June. London 1956, p. 451-453 ( gracesguide.co.uk [PDF]).
Web links
- Short color video with the passing of a class D16 / 2 double unit
- Picture gallery with all three machines
Individual evidence
- ↑ The technical data are taken from the publication by OSNock, October 2, 1953, p. 425 (see literature) and, if necessary, converted to SI units (decimal places rounded). Different data for 10203 can be found in OS Nock, May 25, 1956, p. 550
- ↑ History of the Ashford Railway Works in the English language Wikipedia
- ^ The history of the Brighton Railway Works in the English language Wikipedia
- ↑ on its function and reputation: OS Nock in the English language Wikipedia
- ↑ cf. OS Nock, 1953
- ↑ Since the term measuring car is misleading here, another reference to the English language Wikipedia: Dynamometer car
- ↑ cf. OS Nock, 1953, p. 427
- ↑ cf. OS Nock, 1953, p. 453
- ↑ cf. British Rail , as well as in the English Wikipedia BTC
- ↑ cf. OS Nock, 1956
- ↑ David Ross: The International Encyclopedia - Trains and Locomotives . Translated by Ulrich Lieb. transpress Verlag, Stuttgart, 1st edition 2005, p. 284
- ↑ An operating scene with 10201
- ↑ a b Photo receipts from the time
- ^ Martin Hart: English Electric. Class 40, 50 & 55 Diesel Locomotives. Amberley Publishing. Stroud 2014. ISBN 978-1-4456-3340-4
- ^ Work history Derby railway works in the English language Wikipedia