Freeware models of EMD GP7 and GP9 engines are now available on my website. The engines are available in New York Central, Boston & Maine, Penn Central, and Great Northern liveries.
The models have been scratch-built but utilize sounds from the old Kuju\RailsimulatorUS F7 locomotives. The US Loco and Assets pack is thus required to run the GP7s and GP9s.
The engines should be fairly simple to repaint and a layered repaint texture kit is available upon request.
Please visit Golden Age of Railroading to download the engines and for more information.