This train is something of a no brainer, it exists in Train Sim Classic, they are equally many in service as the class 70, more fuel efficient than the class 66 (less wattage from your psu I guess??) and best of all, sounds like a italian sports car on steroids that has just taken Sulfur Hexaflouride. It is more versatile than the class 66 as it both can do freight as well ass passenger services. What are the "big hurdles" from making this a reality given that Dovetail once already made this as an add-on in TSC. I mean just listen to it!!
Well they first need to get licensing from the toc. Then they have to get reference material. Tsc might not mean good reference material to use in tsw so they might have to reget it. Then actually creating it, making sure there is a route for it, etc
The Class 68s are often used for nuclear cask trains in Britain. A Class 68 should have been included with the nuclear train pack, along with the Class 20. We should also get the other British Stadler locos (Class 88, 93, and 99.) in game.