page_title: New Zealand TR class locomotive
section_title: W. G. Bagnall
hierarchical_section_title: New Zealand TR class locomotive / Manufacturers / W. G. Bagnall
caption_attribution_description: English: New Zealand Railways TR class diesel shunting locomotive at Ferrymead, Christchurch
context_page_description: The New Zealand TR class locomotive is a type of diesel shunting locomotives built by many different manufacturers. Defined as "shunting tractors" or "rail tractors" by KiwiRail and its predecessors, they are classified "TR" for tractor as a result. Many of these locomotives have been withdrawn, but some are still in service. The first locomotive of this class was built by NZR in 1924. The most powerful were Japanese-built Hitachi TRs, with 138kW Cummins engines.
context_section_description: W G Bagnall built seven TRs in 1956-57. The first five were supplied with McLaren M6 engines, the last two with Gardner 6L3 engines, all with a Self-Changing Gears 4-speed gearbox. The McLaren engines were unsuccessful, so from 1973 TR 150-154 were re-engined with the Gardner 6LX with Twin Disc torque converters. These TRs were the heaviest and one of the more powerful types.
caption: Bagnall built TR156 at Ferrymenad
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