Two diesel GM 6-71. 6 cyl. inline 2 stroke. 107.95mm (4 1/4 in.) bore x 127mm (5 in.) stroke.
Power output
140 hp (105kw) at 1900 rpm. Wheel arrangement 1A-A1
Transmission
Allison series 600. David Brown final drive. The final drive included pneumatic dog clutches to activate forward or reverse gear. As the dogs on either dog clutch would fail to engage at times, a rotating brake was provided on the transmission shaft. This brake was a pneumatic arrangement that rotated the transmission shaft back and forth until the dogs slid into place. Electric limit switches detected when the forward or reverse dog clutches were properly engaged.
Braking system(s)
Westinghouse air brake
Track gauge
Narrow 1,067 mm (3 ft 6 in) Later converted to Standard 1,435 mm (4 ft 8+1⁄2 in)
The NDH class railcars are a class of self propelled diesel-hydraulic railcars designed by Commonwealth Engineering and built by the Gloucester Railway Carriage & Wagon Company in England for the Commonwealth Railways, Australia in 1954. They were known as Gloucester railcars.
Commonwealth Railways placed an order for six NDH railcars with Commonwealth Engineering in 1952. The NDH railcar's design had evolved from the Queensland Railways 1800 class rail motor. Queensland Railways had designed the 1800 class and Commonwealth Engineering had built them at their plant at Granville NSW, starting in 1952. At that time Commonwealth Engineering was overwhelmed with orders for rolling stock from around Australia, so it arranged for the Gloucester Railway Carriage & Wagon Company, to subcontract the construction of the NDHs.[1][2][3]
NDH1 and NDH2 were the first two of six NDH railcars to enter service on the narrow gauge Central Australia Railway. They commenced operation on 16 December 1954 and provided a passenger service between Port Augusta and Marree. When two more of the railcars arrived from England, NDH1 and NDH2 were transferred to the North Australia Railway. NDH1 and NDH2 arrived at Larrimah after being transported by road from Alice Springs, on the 11th of July 1955.[1][2][3][4][5]
Due to the alteration in train services following the opening to Brachina of the new standard gauge Stirling North to Marree railway in 1956, NDH railcars were used for a time on the old narrow gauge Quorn to Hawker section but passenger numbers were low, so the NDH railcars were replaced with mixed trains.
With the completion of the standard gauge Marree line from Stirling North in 1957, Commonwealth Railways found that they no longer needed the narrow gauge NDH railcars. Also in 1962 NDH1 and NDH2 were transported back from Darwin to the Central Australia Railway as Commonwealth Railways had reverted to using mixed trains to provide the passenger service on the North Australia Railway.
After eight years in service, all six NDH railcars had become redundant for narrow gauge use.[6][7]
^ ab"Australasia" Diesel Railway Traction February 1955 page 49
^ ab"Diesel Economy in Central Australia" Diesel Railway Traction August 1955 page 253
^ ab"Notes and News" Diesel Railway Traction December 1955 page 386
^"Australasia" Diesel Railway Traction April 1956 page 137
^"Commonwealth Australia Railways" Railway Gazette 13 April 1956 page 187
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