British Rail 10800
|British Railways 10800|
10800 on the down main platform at Rugby
|Builder||North British Locomotive Company|
|AAR wheel arr.||B-B|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Wheel diameter||3 ft 6 in (1.067 m)|
|Minimum curve||3.75 chains (75 m)|
|Wheelbase||31 ft 0 in (9.45 m)|
|Length||41 ft 10 1⁄2 in (12.76 m)|
|Width||9 ft 2 in (2.79 m)|
|Height||12 ft 9 1⁄2 in (3.90 m)|
|Locomotive weight||69.80 long tons (70.92 t; 78.18 short tons)|
|Fuel capacity||300 imp gal (1,400 l; 360 US gal)|
|Coolant capacity||85 imp gal (390 l; 102 US gal)|
|Water capacity||90 imp gal (410 l; 110 US gal)|
|Prime mover||Paxman 16RPHXL Series 2
rebuilt: Maybach MD655
|Traction motors||BTH 159, DC, four (4) off|
|Cylinder size||7 in × 7 3⁄4 in (177.80 mm × 196.85 mm)
rebuilt: 7 1⁄4 in × 8 3⁄4 in (184.15 mm × 222.25 mm)
|Multiple working||Not fitted|
|Top speed||70 mph (110 km/h)|
|Power output||827 hp (617 kW)
rebuilt: 1,400 hp (1,000 kW)
|Tractive effort||34,500 lbf (153.5 kN)|
|Train heating||Clarkson steam generator|
|Locomotive brake||Brakeforce: 45 long tons-force (450 kN)|
|Power class||3MT; later: Type 1|
|Axle load class||Route availability: 4|
|Disposition||Sold Brush Traction, rebuilt into research locomotive Hawk, retired 1968, cannibalised 1972–1976, scrapped 1976.|
British Railways 10800 was a diesel locomotive built by the North British Locomotive Company for British Railways in 1950. It had been ordered by the London, Midland and Scottish Railway in 1946 but did not appear until after the 1948 nationalisation of the railways.
Design was by George Ivatt and the locomotive was intended as a possible replacement for steam locomotives on secondary and branch lines. The single-cab layout (long bonnet forward) gave the driver a poor view of the road ahead. The view was no worse than a steam locomotive's, so it would have been considered acceptable at the time.
Due to having been ordered by the LMS before the creation of British Railways (BR), 10800 became the first BR mixed-traffic Diesel-Electric locomotive when it was delivered in 1950. Operationally it was successful enough for BR to order two classes of 54 similar locomotives in 1955 although these, destined to be come BR Class 15 and BR Class 16, used the improved YHXL engine.
- Bogie wheelbase: 8 ft 6 in (2.591 m)
- Bogie pivot centres: 22 ft 6 in (6.86 m)
- Sanding equipment: Pneumatic
- Heating type: Steam (Water-tube boiler) (Clarkson thimble tube boiler) – Clarkson
- Main generator type: BTH
- Aux generator type: BTH
- Gear ratio: 66:15
- Boiler water capacity: 300 imp gal (1,400 l; 360 US gal)
- Boiler fuel capacity:* 90 imp gal (410 l; 110 US gal)
In 1961 or 1962 (sources differ) No. 10800 was bought by Brush Traction and rebuilt for experiments in a.c. power transmission. Brush named the locomotive "Hawk".
- Main alternator type: Brush
- Aux alternator type: Brush
It was used until 1968, and slowly stripped for parts from April 1972, until it was finally scrapped at Brush Traction, Loughborough in 1976.
- Clough, David N. (2011). "2: Diesel-Electric Development after 1945". Hydraulic vs Electric: The battle for the BR diesel fleet. Ian Allan. pp. 18–19. ISBN 978-0-7110-3550-8.