- NZR EW class
NZR EW class EW 1805 with DC 4611 near Paekakariki. Photo by Alan Wickens Power type Electric Builder English Electric, United Kingdom UIC classification Bo-Bo-Bo Gauge 1,067 mm (3 ft 6 in) Length 18.9 metres (62 ft 0 in) Weight on drivers 76 tonnes (75 long tons; 84 short tons) Locomotive weight 76 tonnes (75 long tons; 84 short tons) Electric system 1500-volt DC Current collection
Pantograph Traction motors 6 Top speed 97 km/h (60 mph) Power output 1,340 kW (1,800 hp) Tractive effort 104 kN (23,000 lbf) Class EW Number in class 7 Locale Wellington region First run 1952 Last run 1988 Disposition 5 scrapped
They were the first class of locomotive in New Zealand to utilise the Bo-Bo-Bo wheel arrangement, the other classes being the DJ class and the EF class. In both cases, this wheel arrangement was used to provide a lower axle-load due to track conditions. The EW class is different though, as the locomotive is articulated in the middle over the centre or Jacobs bogie where as the two newer classes have sideplay in the centre bogie.
During the 1960s the tunnels on this section were lowered so that DA class diesel locomotives could handle trains all the way through to Wellington. With the introduction of the EM class units in 1982, the class was further displaced. An attempt was made to use two members of the class on the Otira - Arthur's Pass electrified section in the South Island, but nothing came of this. All were withdrawn from service by 1988. Two remain preserved today, one at Ferrymead in Christchurch and one at Mainline Steam in Plimmerton, north of Wellington.
Key: In service Out of service Auckland Transport service Preserved Overhaul Scrapped TMS number Original number Notes 107 1800 Scrapped 113 1801 Scrapped at Woolston 1988 136 1802 Written off 1981, scrapped 142 1803 Scrapped 159 1804 Scrapped 165 1805 Preserved by Mainline Steam 171 1806 Preserved by Ferrymead Railway
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