This would be a nice addition to the game. Various types of traction such as TransPennine Express Class 68 + Mk5a coaches, and Siemens Class 185. This route is also popular charter train territory so excursion trains are also an option. I also believe Northern are looking at reintroducing a service along this line and currently operate between Seamer and Scarborough so Class 150/155/156/158 could also be contenders to be added to the game.
Yes please! Though perhaps an extension to Leeds would make it more replayable. 68+Mk5s are a must! (Love seeing those crossing the Ouse in York) and an extension to Leeds would allow for Northern services between York and Leeds to be added just for extra runs, semi-fast long and service through the countryside or a short local stopping service.