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The NZR RM class Midland railcar (or Leyland diesel railcar) was the first successful railcar, and first diesel-powered vehicle, to enter revenue service in New Zealand. Two were built, RM 20 and RM 21, and they ran for five years from 1936 to 1941 before being replaced by larger Vulcan railcars. They operated primarily on the Midland Line and the Greymouth-Hokitika portion of the Ross Branch. These kinds of vehicles were known in some other countries by a variety of other names, including "railbuses" and "railmotors". However, such self-propelled passenger vehicles were known in New Zealand as "railcars" from the late-1920s onwards.
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