The ‘remanufacture’ of a locomotive as a process in which all of the power assemblies of a locomotive engine are replaced with freshly manufactured (containing no previously used parts) or refurbished power assemblies or those inspected and qualified. Inspecting and qualifying previously used parts can be done in several ways, including such things as cleaning, measuring physical dimensions for proper size and tolerance, and running performance tests to assure that the parts are functioning properly and according to specifications. Refurbished power assemblies could include some combination of freshly manufactured parts, reconditioned parts from other previously used power assemblies, and reconditioned parts from the power assemblies that were replaced. In cases where all of the power assemblies are not replaced at a single time, a locomotive will be considered to be ‘remanufactured’ (and therefore ‘new’) if all power assemblies from the previously new engine had been replaced within a five year period. (This definition for remanufactured locomotives is taken from the US Federal Register Volume 63, No.73 April 16, 1998 / Rules and Regulations for the Environmental Protection Agency (EPA) 40 CFR Parts 85, 89 and 92 (Emission Standards for Locomotives and Locomotive Engines)