I know USA railway is mainly diesel locomotive, but also has some beautiful electric locomotive,eg.Acela Express,ACS-64,HHP-8.I hope JR can make these electric loco in the near future.
ATSF854 has a GF6C in the works. It would be cool if JR did a "Traction Pack" with a few boxcabs and steeple cabs, and an "Interurban Pack" with a few cars, a freight trolley, and maybe 1-2 work cars.