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This page is a sandbox for the BESA design M class locomotives. WIP

BESA class M
Type and origin
Power typeSteam
DesignerBritish Engineering Standards Association
Specifications
Configuration:
 • Whyte4-6-0
 • UIC2'C n2
Driver2nd driving wheel
Gauge1,000 mm (3 ft 3+38 in)
Coupled dia.48 in (1,200 mm)
Wheelbase:
 • Axle spacing
(Asymmetrical)
First and second drivers: 5 ft 4+12 in (1.638 m)
Second and third drivers: 6 ft 7+12 in (2.019 m)
 • Engine21 ft 1 in (6.43 m)
 • Leading4 ft 9 in (1.45 m)
 • Coupled12 ft (3.7 m)
 • Tender11 ft (3.4 m)
 • Tender bogie5 ft 6 in (1.68 m)
 • incl. tender42 ft 1+14 in (12.833 m)
Length:
 • Over buffers52 ft 7+1316 in (16.048 m)
Width7 ft 9 in (2.36 m)
Height11 ft (3.4 m)
Axle load8.7 t (8.6 long tons; 9.6 short tons)
Service weight33.5 t (33.0 long tons; 36.9 short tons)
Firebox:
 • TypeBelpaire
Safety valveRamsbottom
CylindersTwo, outside
Valve gearWalschaerts, Caprotti
Valve typeSlide, piston
Career
LocaleBritish Raj, later India, Pakistan, and Bangladesh
Myanmar
Thailand
Cambodia
Aden Province
Iraq
Preserved10 (Thailand)
Reference(s): [1]

The Indian locomotive class M (Mixed) were a class of 4-6-0 mixed traffic metre gauge locomotives introduced in 1903[a] that were one of several standard locomotive designs developed by the British Engineering Standards Committee (BESC) (later the British Engineering Standards Association (BESA)) for the railways of British India.

Background

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British Indian railways operated numerous steam locomotives built to their own design standards, and at the turn of the century, this created a considerable strain on British locomotive manufacturers who could not keep up with demand. This led to British Indian railways outsourcing production of locomotives to non-British companies, which generated complaints from British locomotive manufacturers,[2] so the BESC was requested by the British Indian government to assemble a locomotive committee[3] which included British locomotive manufacturers to develop standard locomotive classes for British Indian railways in order to ease the strain placed on British locomotive manufacturers.[4] Its first report, compiled in 1903,[1][a] outlined plans for British Indian standard locomotives, being revised in 1907[5] and in 1910.[6]

History

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BESA drawings of the M class

The M class locomotives were first catalogued in the first report of the BESC on British Indian standard locomotive classes (1903).[1][a] They then found their way into British Indian (later Indian, Pakistani, and Bangladeshi), Burmese, Cambodian and the Thai railways who then operated locomotives built to this design.

Design

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The locomotives were designed to use the same boilers as the class G (Goods) 4-8-0 and the P (Passenger) 4-6-0 locomotives—also of the metre gauge,[1] two outside cylinders, a Belpaire firebox[1] and saturated steam;[7] superheated versions were classified as MS[7] (S means superheated). The valve gear used was the Walschaerts valve gear (some Thai locomotives were converted to Caprotti[citation needed]) with slide valves;[1] superheated variants were equipped with piston valves.[citation needed] The reversing gear was located on the right-hand side of the cab, controlled by a screw reverser.[1] The wheelbase between the two rear driving wheels are longer than those of the two front driving wheels to accommodate the firebox and grate.[b] The size of the drivers did not neccessitate the need to fit splashers above the wheels on the running board.[c] The tender had a fuel capacity of 4 tons, a water capacity of 4000 gallons, and a half-cab.

Foreign operators

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Burma (Myanmar)

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Several locomotives of this BESA design were delivered to Burma Railways and were classified as class K. Superheated versions were classified as Ks (S means superheated).[8]

Thailand

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The Royal State Railways of Siam/Thailand (RSR(S/T)), later the State Railways of Thailand (SRT), had several locomotives of this BESA design and were classified as the class E.[9] Some were later donated to Cambodia in the 1970s, by then considered surplus by the SRT.[10]

Several E class locomotives are preserved at various locations in Thailand.[citation needed]

Cambodia

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As stated earlier, some Thai E class locomotives were donated by the State Railways of Thailand (SRT) to Cambodia in the 1970s.[11] They were classified under the 230-0xx number series[d], upon withdrawal of the Indonesian C52s that were brought over from Java to Cambodia during the Japanese occupation which were numbered in the same number series.[12]

Aden Province

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Construction on a metre gauge railway from Aden—the Aden Railway—were undertaken by the Royal Engineers during 1915-16, with administration being handled by the North Western Railway of India. An engine of this design became part of the Aden Railway's motive power fleet, built by Nasmyth, Wilson and Company, being numbered 1.[13]

Iraq

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The Iraqi State Railways had several locomotives built to this design for the railway's metre gauge network, which were designated as their HG and HGS (superheated) class locomotives.[citation needed]

Notes

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  1. ^ a b c The report was compiled in 1903, but was not published untill 1905.
  2. ^ The wheelbase between the first and second drivers measured 5' 4 1/2", and between the second and third drivers it measured 6' 7 1/2".
  3. ^ The driving wheel diameter measured 4'. This also was the case with the G class 4-8-0 locomotives with a driving wheel diameter of 3' 7". The 4-6-0 P class had a wheel diameter of 4' 9", therefore neccessitating the addition of splashers on the running board to make space for and cover the wheels.
  4. ^ The Cambodian railway network—being developed by the French, used the French locomotive classification system, counting axles instead of wheels—therefore 230 meant a 4-6-0 type locomotive.

References

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  1. ^ a b c d e f g Report of the Locomotive Committee on Standard Locomotives for Indian Railways (Report). British Standards Institution. November 1903. Retrieved 8 September 2024.
  2. ^ Bhandari, R. R. "Steam in History". IRFCA website. Indian Railways Fan Club (IRFCA). Retrieved 8 September 2024. [The inability of British locomotive manufacturers to meet demand] resulted in orders being placed on German and American manufacturers and ... protest was made on behalf of the [British locomotive manufacturers] in the British Parliament.
  3. ^ Report of the Locomotive Committee on Standard Locomotives for Indian Railways (Report). British Standards Institution. November 1903. p. 2. Retrieved 8 September 2024. ... with ... instructions received ... from the Secretary of State for India ...
  4. ^ Bhandari, R. R. "Steam in History". IRFCA website. Indian Railways Fan Club (IRFCA). Retrieved 8 September 2024.
  5. ^ Second Report of the Locomotive Committee on Standard Locomotives for Indian Railways (Report). British Standards Institution. February 1907. Retrieved 10 September 2024.
  6. ^ "[Third Report of the Locomotive Committee on Standard Locomotives for Indian Railways]". Indian Industries and Power. Vol. 7. 1909. p. 275. Retrieved 10 September 2024.
  7. ^ a b Smith, Jonathan. "BESA steam locomotives". Standard steam locomotives, The Terminal. Iowa State University. Retrieved 8 September 2024.
  8. ^ Smith, Jonathan. "Burma Railway steam locomotives". Standard steam locomotives, The Terminal. Iowa State University. Retrieved 8 September 2024.
  9. ^ Smith, Jonathan. "[Rot Fai Thai (SRT)] (metre-gauge) steam locomotives". Standard steam locomotives, The Terminal. Iowa State University. Retrieved 8 September 2024.
  10. ^ Roberts, Basil. "Thai E class before donation to Cambodia". Tiger Steam photo gallery, Thailand. International Steam Pages. Retrieved 8 September 2024.
  11. ^ Roberts, Basil. "Ex-Thai E class locomotive in Cambodian service". Tiger Steam photo gallery, Cambodia. International Steam Pages. Retrieved 8 September 2024.
  12. ^ Martindale, Colin. "Derelict ex-Thai E class locomotive in Cambodia". Tiger Steam photo gallery, Cambodia. International Steam Pages. Retrieved 8 September 2024.
  13. ^ "Rolling stock for the Aden [Railway]". The Locomotive Magazine and Railway Carriage and Wagon Review. Vol. 34. London: Locomotive Publishing Company. 15 February 1928. pp. 42–43. Retrieved 13 November 2024. Retrieved via Flickr.