The advantages of diesel and electric engines over steam locomotives are described in this 1956 film clip. By the mid-1950s diesel engines were well established, but only two South Island tunnels and Wellington's commuter lines were electrified.
Te whakamahi i tēnei tūemi
Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: New Zealand Railway Magazine. National Film Unit, 1956
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