G-volution and SBL-Rail present dual fuel evolution concepts for Class 37, Class 59 and Class 66 locomotives. Dual fuel engines use compression ignition and burn two fuels simultaneously. This work shows how diesel fuel can be replaced by renewable net-zero carbon emissions fuels. The original diesel tanks were replaced with smaller ones and cylinders for biomethane or biopropane or hydrogen were installed. Compared to the original two-stroke EMD engine, the new four-stroke dual-fuel engine has a 10% reduction in fuel consumption. If a Diesel Particulate Filter (DPF) is installed, the engine will spend less time responding to the increase in back pressure when the DPF fills. Route simulations were completed using OTMRs provided by these locomotive operators in combination with dual fuel engines.