High Quality Content by WIKIPEDIA articles! The GT46C ACe are a model of Australian diesel electric locomotives built by Downer Rail using EMD components. The first units were built as the SCT class for freight operator SCT Logistics from 2007, with delivery and entry to service through 2008. Additional units have since been built as the LDP class for Locomotive Demand Power (a 'Power-By-The-Hour' strategy by Downer Rail to provide a fleet of lease-available locomotives to the Australian rail industry) and the TT class for Pacific National. The class designation is said to stand for 'Tonnage Transferrable'; the term apparently deriving from the fact that the locomotives have removable mass installed behind the headstocks at either end. The class was originally built as LDP 011 - 018 for lease to Pacific National but PN subsequently requested purchase of the locomotives and the slight modification to their design. With the extra weight added they are 139 tonnes but with the weight...