GWE needs 165’s in the route since in real life they have these too.165’s started operating in 1992 in GWR which was FGW(First Great Western) to this day 166’s and 165’s are being moved to other GWR routes due to class 387’s taking over. Some 166’s and 165’s run on the London Paddington to Oxford route, but some class 800/802’s run the route(Remember they are diesel electric trains). Here are pics Class 165 116 at London Paddington Class 165 106 heading to Oxford
I agree both class 165 two and three car sets would be good to have. It looks odd seeing a three car 166 heading down the Windsor branch! I don't think there are enough class 166's to cover all the service mode diagrams either so some duplication of numbers must occur.
