The KLW SE15B is a low-emissions dieselswitcherlocomotive built by Knoxville Locomotive Works. It is powered by a single MTU Series 2000 engine which develops a total power output of 1,560 horsepower (1,160 kW). An unknown number SE15B locomotives is being produced for Chevron to be used in the refineries of Houston and Beaumont-Port Arthur, TX.