TSW is really missing a ÖBB 1044 as this loco was operated on all routes in Austria and was used for passenger and freight trains also in Switzerland and Germany. This loco would fit in many already existing TSW routes very well and is an icon with high versatility. Really hope to see this iconic loco soon in TSW! https://en.wikipedia.org/wiki/ÖBB_Class_1044
I would rather suggest 1144... which is pretty much 1044 but with major improvements in technical department and IRL reliability (those do tons of work in freight and passenger traffic even today)... as for accompanying coaches, I would love both CityShuttle and CityShuttle cab car (in some discussion on the internet a pretty knowledgeable guy explained to me that if 1144 is in a consist with purely CityShuttle carriages and cab car, even if the loco itself is capable of 160 kph, some regulations limit the whole consist to 140 cos CityShuttle carriages lack stronger brakes - this would be interesting thing to implement) and Wiesel dostos and cab car (the modernized CityJet variant only features slightly better accessibility, better seating and such, otherwise it is still classic Wiesel dosto cab car)... now just improve and fix 1116 (with proper LZB/AFB release thing, also some ppl reported that AFB braking cant be manually overriden, cant confirm, havent played Semmeringbahn in a while), and you have rolling stock ready for every and any Austrian commuter route (these combinations also often do REX or occasional D/IC services)... we have the IC coaches already in-game, so...