The ML4000 is a Diesel Hydraulic locomotive built by German manufacturer Krauss-Maffei in the 1960s. The engines had 2 prime movers and produced 3540 HP. In the US, only the SP and D&RGW purchased these engines. There were two versions: a cab-unit with a body similar to an EMD F-unit, and a hood-unit (like an SD40-2). The ML4000s were not very successful, but one (SP 9010) was restored with one of its diesel engines. #9010 is operational at the Niles Canyon Railway in California. If this engine is made, the DLC pack should include both the SP and D&RGW locos, plus period rolling stock. This engine could be used on the D&RGW Soldier Summit route or maybe Cajon Pass. Perhaps the ML4000 could also be featured in a new SP 1960s route or maybe a Niles Canyon Railway route.