The DM class units were an exception to this.
The EM class in Wellington stands for Electric Motor and the ET stands for Electric Trailer. Most diesel-electric shunting locomotives have a three-letter classification with DS as the first two letters, following on from the original diesel-electric shunting class that was known simply as the DS class.įor electric locomotives the second letter generally referred to where the locomotive was based, such as EC in Christchurch, EO in Otira and EW in Wellington. If an entire class had been withdrawn from service and the classification no longer in use, it was sometimes re-used for example, two A classes exist, one from 1873 and one from 1906.įollowing the introduction of the computer-based Traffic Monitoring System (TMS) and consequent renumbering, classes were identified by the two upper-case letters with the first letter remaining D or E respectively and sub-classes being indicated by a third upper-case letter, such as DAA (DA modified for hump shunting), DAR (DA with rebuilt superstructure), DFT (DF with turbo-conversion), DXR (rebuilt DX) and so on. For example, the DJ class was followed by the DX class followed by the DF class. New classes were not always given the classification that alphabetically followed that of the previous class that had most recently been acquired. The second and third letters are sometimes represented as smaller-sized upper case (for example, as seen on many locomotive cab-side number plates). For example, the 1906 A class was followed by the A A and A B classes.ĭiesel-electric and electric locomotive classifications originally consisted of an upper-case D or E respectively followed by a second and sometimes a third (sub-class) letter. When a new class was built as an enhancement of an old class, the old class's letter was re-used, followed by a superscript upper-case letter. Steam locomotives were originally categorised with just a single letter, such as the " F class". Horses had replaced Palmerston by 1874, but, in 1875, after iron had replaced wooden rails, the same branch had an A class steam locomotive built in Wellington by E.W. The first locomotive entirely built in the country was a 10 hp (7.5 kW) engine for the Foxton Tramway contractor, Ashworth Crawshaw, by R. Similarly, a steam crane was converted during construction of the Port Chalmers railway, though it could only haul about 10 tons. Fraser and Tinne built an 0-4-0 in Auckland in 1872, but it was based on a Hornsby traction engine.
The first steam engines built in New Zealand were produced in 1872. 1994 replica of 1872 Palmerston locomotive was built on a 1931 La-6 truck and is outside Foxton's Court House Museum, as seen in 2018
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