The GT46C ACe is a model of diesel electric locomotive designed and built by Downer Rail, Cardiff using Electro-Motive Diesel components between 2007 and 2013.The first units were built as the SCT class for freight operator SCT Logistics from 2007 followed by the LDP class for Downer Rail's Locomotive Demand Power division, the TT class for Pacific National, the GWA class for Genesee & Wyoming Australia, the WH class for Whitehaven Coal, and the SSR class for Southern Shorthaul Railroad.