- NZR EO class (1923)
NZR EO class (1923) Eo 3 running around a train at the Ferrymead Heritage Park. Power type Electric Builder English Electric
Dick Kerr Works, Preston, United Kingdom
Build date 1923 UIC classification Bo-Bo Gauge 3 ft 6 in (1,067 mm) Length 11.7 metres (38 ft 5 in) Weight on drivers 50.0 tonnes (49.2 long tons; 55.1 short tons) Locomotive weight 50.0 tonnes (49.2 long tons; 55.1 short tons) Electric system 1500 V DC Current collection
Pantograph Traction motors 4 Top speed 64 km/h (40 mph) Power output 510 kW (680 hp) Tractive effort 63 kN (14,000 lbf) Class EO Number in class 5 Number 2 - 6 Locale Midland Line between Otira and Arthur's Pass First run 1923 Last run 1968 Scrapped 1969 Disposition 4 scrapped
The New Zealand Railways EO class of 1923 were electric locomotives used on the steep Otira to Arthur's Pass section of the Midland Line. They were primarily for pulling trains through the 8.5 km Otira Tunnel to avoid the buildup of steam, smoke and soot.
When the Otira tunnel was being built, steam locomotives were not considered for use in the tunnel, because smoke would build up in the tunnel and be difficult to clear. Tenders were received from English Electric, and a company in New York. Due to the economic situation at the time, the tender was given to English Electric. And so on the 10 April 1923, numbered EO 2 to EO 6 (1 was the Class E battery electric loco built in 1922.)
They were later reclassified EO to avoid confusion with the EC class locomotives.
The locomotives coped well in service, and from 1942 it became standard practice to run three locomotives together with only two pantographs up, and have their pantographs linked by jumper cables. This was deemed dangerous however, and soon each locomotive ran with its own pantograph up. This often resulted in heavy sparking. Once it became normal to run three locomotives together, they were altered in 1940 to a single cab design.
Replacement and preservation
There were replaced in April 1968 by the EA class locomotives. The EA class were later redesignated as EO class (of 1968).
- Pasrsons, David, New Zealand Railway Motive Power 2002, (2002), Chapter 1, ISBN 0-908573-78-2
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