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Compared with its M54 predecessor, the N52 features Valvetronic (variable valve lift), [7] a lighter block due to the use of a magnesium alloy [8] and an electric water pump (replacing the belt-driven water pump) [9] [10] and a variable output oil pump. [11] The redline was increased from 6,500 rpm to 7,000 rpm, except for N52B25 (130 kW). [12]
Under the Whyte notation for the classification of steam locomotives, a 4-8-8-2 is a locomotive with four leading wheels, two sets of eight driving wheels, and a two-wheel trailing truck. Other equivalent classifications are: UIC classification: 2DD1 (also known as German classification and Italian classification) French classification: 240+041
[3] [4] The N&W mechanical department team originally considered a class N 4-8-4 type, but deemed its 63 in (1,600 mm) driving wheels inadequate for the N&W's railway grades. [3] [5] N&W mechanical engineer H.W. Reynolds redesigned the drivers' diameter to a 70 in (1,778 mm) design that could be counterbalanced against wheel slippage.
The 4-8-2+2-8-4 Double Mountain was probably the optimal Garratt wheel arrangement, with the four-wheeled leading bogies and the two-wheeled trailing trucks on each engine unit ensuring stability at speed and with sixteen coupled wheels for traction. More coupled wheels would inhibit the locomotive on tight curves, while the only advantage of ...
This model was manufactured between 1984 and 1989, with 49 examples of the model built for North American railroads. All but 4 of these units were ordered by Norfolk Southern. The others were 3 units ordered by Burlington Northern Railroad, and a GE demonstrator unit. Prime mover: GE 12-cylinder V-type 7FDL-12 four stroke diesel engine
Unlike some other countries which utilised the 4-8-2 design for heavy passenger duties, the Australian 4-8-2 was more typically used as a heavy goods locomotive with small coupled wheels and a very large firebox. The first 4-8-2 in Australia was the 3 ft 6 in (1,067 mm) gauge Q class of the Tasmanian Government Railways.
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