The NEC is a very overdone route on TSW and TSC. Its about time have one set in the Pennsylvania Railroad days. Set around 1965, this route should run from DC Union station(and Potomac Yard) to Philadelphia 30th street station. One thing I want added, is freight trains. Unlike today, through freights were a pretty common site(its still a thing but far less common) on the NEC during the 1960s so if made, having access to freight yards would be great. During this era, E44s and the famous GG1, ran through the Northeast corridor. Since the PRR operated everything on the route during this time, dovetail would need only one license. GG1 E44
I'd like to see it, but unfortunately Killer is right. You might see a third party tackle it at some point (pigs may also fly), but DTG can barely handle doing modern US content anymore.