British Rail Class D16/2

British Railways Class D16/2 was a class of prototype diesel locomotive built by British Railways at Ashford Works and introduced in 1950–1951, with a third example being introduced in 1954. They had been designed by Oliver Bulleid for the Southern Railway and were authorised in February 1947[1] but did not appear until after nationalisation. The diesel engine and transmission were supplied by English Electric, but the Bulleid influence was obvious. The box-like body style closely resembled Bulleid's electric locomotives and was quite different from the usual English Electric style, typified by British Rail Class D16/1 which in turn was stongly influenced by contemporary american design[2].

British Rail Class D16/2
10201 at Tring, 1959
Type and origin
Power typeDiesel-electric
Builder
  • BR Ashford Works (2)
  • Brighton Works (1)
Order numberSR Order 3441
Build date1950 (10201/10202)
1954 (10203)
Specifications
Configuration:
​
 • UIC(1′Co)(Co1′)
 • Commonwealth1Co-Co1
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter
  • Driving: 3 ft 7 in (1.092 m)
  • Idling: 3 ft 1 in (0.940 m)
Minimum curve4.5 chains (297.00 ft; 90.53 m)
Wheelbase55 ft 6 in (16.92 m)
Length63 ft 9 in (19.43 m)
Width9 ft 3 in (2.82 m)
Height13 ft 1 in (3.99 m)
Loco weight133 long tons (135 t; 149 short tons)
Fuel capacity1,150 imp gal (5,200 l; 1,380 US gal)
Lubricant cap.16 imp gal (73 l; 19 US gal)
Coolant cap.280 imp gal (1,300 l; 340 US gal)
Prime moverEnglish Electric 16SVT
Traction motorsEnglish Electric 526A, 6 off
Cylinder size10 in × 12 in (254.0 mm × 304.8 mm)
Train heatingSteam
Train brakesVacuum
Performance figures
Maximum speed90 mph (140 km/h)
Power outputEngine:
10201/2: 1,750 bhp (1,300 kW)
1,600 bhp (1,200 kW) from 1957
10203: 2,000 bhp (1,500 kW)
At rail :
10201/2 1,300 bhp (970 kW)
Tractive effort10201/2: 48,000 lbf (213.5 kN)
Career
OperatorsBritish Railways
Class
  • 10201/2: D16/2, later 16/9
  • 10203: D20/3, later 20/9
Power class
  • 10201/2: 6P5F, later 5P5F
  • 10203: 7P6F, later 6P6F
Numbers10201–10203
Axle load classRA 6
Withdrawn1963
DispositionAll scrapped

Unusually for pioneer British diesels, 10201 and 10202 were originally specified (prior to alteration of gear ratios to improve tractive effort when operating as mixed-traffic units) with a top speed of 110 mph (180 km/h) rather than the 90 mph (140 km/h) of 10203,[3] pre-dating the three-figure maximum speeds of the Deltic and Class 50 designs by some years.

Percy Bollen's bogie design[4] and the power train of 10203 were taken almost unmodified for the first ten production British Rail Class 40s but with a more traditional English Electric design of body with prominent noses and louvred side panels.

Operation
10203 at Wolverton, in 1957

The original locomotives, numbered 10201 and 10202, worked services on the Southern Region of British Railways. They were transferred to Camden depot in the London Midland Region in April 1955.

Number 10203 was outshopped from Brighton Works in March 1954, its modified engine giving a power output of 2,000 hp (1,500 kW).[5][6] It was trialled on the Southern Region before joining its sisters on the London Midland, being allocated to Willesden depot.

All three locomotives were non-standard with regards to spare parts and servicing and they were withdrawn at the end of 1963. After spending some time on the scrap line at Derby Litchurch Lane Works they were eventually scrapped at Cashmore's at Great Bridge in 1968.

Additional information
  • Bogie wheelbase (rigid): 16 ft 0 in (4.88 m)
  • Bogie wheelbase (total): 21 ft 6 in (6.55 m)
  • Bogie pivot centres: 28 ft 6 in (8.69 m)
  • Sanding equipment: Pneumatic
  • Heating boiler: Spanner
  • Gear ratio: Originally 17:65, amended to 19:61
  • Boiler water capacity: 880 imp gal (4,000 l; 1,060 US gal)
  • Boiler fuel capacity: From main supply

Footnotes
  1. Clough, David N (2011). Hydraulic vs Electric: The battle for the BR diesel fleet. Hersham: Ian Allan. pp. 19–21. ISBN 978 0 7110 3550 8.
  2. Dyer, Malcolm (1982). BR Class 40 Diesels. Truro: Bradford Barton. p. 1. ISBN 0 85153 430 9.
  3. "From 10202 To 50050: Waterloo - Exeter Diesel Operations". Archived from the original on 8 July 2014. Retrieved 23 April 2014.
  4. "Brief Biographies of Major Mechanical Engineers". Steamindex. Steamindex. Retrieved 11 February 2017.
  5. British Railways Diesel-Electric Main-Line Locomotive Railway Gazette 28 May 1954 pages 609/610
  6. British Railways 2,000 HP Locomotive Diesel Railway Traction August 1954 pages 181/182
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References
  • Strickland, David C. (September 1983). Locomotive Directory: Every Single One There Has Ever Been. Camberley, Surrey: Diesel and Electric Group. pp. 27, 29. ISBN 978-0-9063-7510-5. OCLC 16601890.
  • Stephens, Robert (1988). Diesel Pioneers. Atlantic Transport. ISBN 0-906899-29-X.

Further reading
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