High hood Locomotives would be a great addition to the game. So would a nice revamp on freight routes and well as some news ones too.
As high hoods are my favorite type of locomotive as the gp9 is my favorite locomotive I think high hoods would be the coolest addition ever. We almost have it but it'll be so cool to be able to drive one
I'd love to have a route or two with EMD SD7 or SD9 "Cadillacs" handling freight services. SP or D&RGW both had SD7s and SD9s. Maybe we could see SP Peninsula Corridor and D&RGW Soldier Summit in the future, along with other SP and/or D&RGW classic-era routes. These two routes would also give us other high-hood classic diesels, including EMD GP7s and GP9s, the aformentioned SD7s and SD9s, and an SP FM H-24-66 Trainmaster. The Western Pacific RR also rostered a number of high-hood GP20s. Those should be added too, along with the WP Feather River Canyon Route. As for other classic high-hood locos, we could get the following too: modified Alco RS-3 "Hammerheads" (a few railroads, C&NW for example, had these), Alco RS-11s, Alco RSD-12s, Baldwin Road Switchers (DRS-6-6-1500, DRS-4-4-1500, etc.), and other FM road switchers (H-10-44, H-12-44, H-15-44, H-16-44, H-20-66, etc.).