The 1720 class are a class of diesel locomotives built between 1966 and 1970 by Clyde Engineering, Eagle Farm for Queensland Railways in Australia.
History The 1720 class were an evolution of the 1700 class. They operated throughout Queensland on branchline freight, suburban and mainline passenger services and on shunting duties.1720 Class Queensland's Great TrainsClyde/GM 1720 Class Queensland's Railway Interest Group Later they were modified for driver only operation receiving a larger windscreen and an air conditioning box along with the D symbol added to the end of the locomotive number to indicate driver only operation.
Some have been exported, although the majority as at January 2014 remain in service.1720 Class Railpage Unit 1741 was acquired for preservation by the Queensland Diesel Restoration Group in October 2016. As of June 2025, it is currently on the Zig Zag Railway in Clarence, NSW where it has been refurbished for use on their heritage railway. Unit 1745 is preserved under lease to QPSR
Watco Australia bought three units for use as cattle trains. These were renumbered as the WRE Class.
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