NZR EW class


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
method
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
2 preserved

The NZR EW class locomotive was a class of electric locomotive used in Wellington, New Zealand. The classification 'EW' was due to their being electric locomotives allocated to Wellington.

Contents

Introduction

The Jacobs bogie and bellows of Ew 1806.

They were built by English Electric in 1952 and hauled mainly passenger trains on the region's 1500 V DC electrification, and banked trains between Paekakariki and Pukerua Bay.

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.

Withdrawal

Ew 1806 at the Ferrymead Heritage Park.

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 All were withdrawn from service by 1988.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.

Class register

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

See also

External links


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