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The KLW SE24B or KLW SE20B is a low-emissions dieselswitcherlocomotive built by Knoxville Locomotive Works. It is powered by a single MTU Series 4000 12V R54 (TIER 3) diesel engine which develops a total power output of 2,400 horsepower (1,790 kW). To date, one SE20B locomotive has been produced for KLWX, and it is performing performance disassembly[clarification needed] and operating on the Gulf & Ohio Railways.[2]