Introduction
Built by English Electric, they were introduced in 1938 by the New Zealand Railways Department (NZR) following the opening of the Tawa Flat deviation of the North Island Main Trunk - the section of the old NIMT from Wellington to Johnsonville became the Johnsonville Line from 2 July. Ordered in 1936, the first six motor cars and trailers inaugurated the service. Due to traffic growth, three more motor cars and two more trailers were ordered in 1942 and placed into service in 1946.
Forty more motor cars and 71 trailers were ordered in 1946 for an expansion of suburban services on the Upper Hutt line. They were supplied from 1949 and were used on the Paekakariki service, as the Hutt Valley electrification was not then completed. However this required the use of prewar wooden carriages with electric locomotives in peak periods on the Hutt line until the EM/ET units were supplied.
Read more about this topic: NZR DM Class
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