Plymouth CR-8 locomotives

Plymouth CR-8

Type and origin Power type Diesel Builder Plymouth Build date 1963/4*[n 1] Total produced 10+

Specifications Gauge 1,000 mm (3 ft 3 ^3⁄8 in) 1,676 mm (5 ft 6 in) Length 12.384 m (40.63 ft) over couplers Height 3.556 m (11.67 ft) Loco weight 52 t (51 long tons; 57 short tons)* 45 to 65 short tons (40 to 58 long tons; 41 to 59 t)‡[1][2][n 2] Prime mover two General Motors 12V7 Engine type two-stroke diesel Cylinders V12

Performance figures Maximum speed 80 km/h (50 mph) Power output engine 500 hp (370 kW) @ 2100rpm Tractive effort 155 kN (35,000 lbf)

Career Operators Royal State Railways of Siam (RSR) US Army (vietnam) Vietnam Railways (VR) Bay Area Rapid Transit[4] Numbers RSR : 2001-10 US army : 1988-1997[n 3] ‡ General data The Plymouth CR-8 was a class of 4-axle B'B' centre cab locomotive, built by Plymouth Locomotive Works, USA Several locomotives of type CR-8 have been used in the USA on industrial sites. Ten units (CR-8b) were briefly operated in Thailand in the mid-1960s. During the vietnam war the units were operated by the US army in south vietnam, and after the end of the war became the property of the Vietnam Railways as class D10H. A second class of Chinese built locomotives of type DFH21 have operated as the type D10H on the railways of vietnam from around 1980 onwards. History and design The general design of a CR-8 locomotive was available in weights from 45 to 65 short tons (40 to 58 long tons; 41 to 59 metric tons) with installed power ranging from 400 to 1,000 horsepower (300 to 750 kW), using twin engines with hydraulic transmission via a cardan shaft final drive, in gauges from 3 ft (914 mm) to 5 ft 6 in (1,676 mm).[1] The locomotives used in Vietnam were built by the Plymouth Locomotive Works, USA in the 1960s using two General Motors 12V71 two stroke V12 engines.[5] They were in 1,000 mm (3 ft 3 ^3⁄8 in) The locomotives were originally though to have been operated on the Royal State Railways of Siam (RSR) as numbers 2001-10 during 1963/4.[5][n 1] The locomotives were transferred to South Vietnam in the late 1960s during the period of US involvement in the Vietnam war, and operated as numbers 1988 to 1997 by the US Army. After the end of the Vietnam war in 1975 the class were renumbered as D10H numbers 31 to 40 by the Vietnam Railways.[5] Several units were operated in the USA by industrial operators, as well as MBTA and BART. A higher weight class, the CR-8XT,[n 5] was operated by companies including Bethlehem Steel and the Jones and Laughlin Steel Company.[7] Notes In 'Diesel and gas turbine progress, (1963), ten CR-8 locomotives were noted as having been delivered to the US army (United States Army Aviation and Missile Command).[6] Also quoted as being available in versions from 40 to 120 short tons (36 to 107 long tons; 36 to 109 metric tons).[3] Some units renumbered to within range 1001 to 1010. Not all units received numbers in range 31 to 40.[5]</ref> VR : D10H 31 to D10H 40[n 3]Withdrawn c. 1985 Sources:[5] *Data refers to vietnam locos unless noted.[n 4] USA operated units varied from the specifications of the units used in Vietnam.<ref name='ne'>Chamberlain, Clint (ed.), "Plymouth 40-120T Ind Railroad Locomotives", www.northeast.railfan.net, retrieved September 2012 The CR-8XT was available in weights from 70 to 120 short tons (63 to 107 long tons; 64 to 109 metric tons).[1] References Jane's world railways and rapid transit systems, Franklin Watts, 1978, p. 95 "Plymouth Locomotive Works", Railway Age, 1976, advert, reproduced via waidephoto.smugmug.com International Railway Journal 7, 1967, p. 12, advert Johannessen, Mike. "BART photos". RailPictures.Net. Retrieved 15 November 2014. Gurnett, David, "First D10H/Plymouth CR-8b , Bo-Bo Diesel Hydraulic", Railways in Vietnam (railwaysinvietnam.com), retrieved September 2012 Diesel and gas turbine progress, 1963, p. 34, Plymouth, located in the Ohio city of the same name [..] has just delivered ten of its model CR8-S diesel-hydraulic locomotives to the US Army Aviation and Surface Material Command for undisclosed foreign service.