With the GBR licence already attained, and Greater Anglia under its Anglian branch, it would now be very possible for the Great Eastern Mainline from London to Norwich to be added to the game. Either early 2010s or current day would be my preference with either the Intercity Services being the Class 90 loco hauled sets or the Class 745s with the regional services being run by their respective units during each period.
Probably too far, more chance of The Street to Ipswich per TSC or even just Colchester. But anything GE, any era, is much needed for the UK side of the game.
If they can't get the Greater Anglia licence I personally would prefer the route set in NSE rather than GBR.
Agreed, the only thing that I like about GBR is the livery, I hate the fact these character deprived emu's are all gonna be done up in the same livery, there won't be any telling what's from where unless you look at the region on the branding, the different liveries on these boring emu's was all they had going for them, and now they're all gonna look the same. With units like the the 455s, 319s, 321s, 313s-317s gone, there'll be very little interest in the passenger side of the Uk's railways in future
The sectorisation era would be ideal was we already have: Class 86 Mk2 coaches (but a DBSO would need to be created) 314 which could be adapted into a 315 Freight wagons. 321 could be the new stock, with older units like the 309 or 312 as later DLC. Also, IC swallow and NSE are two of the greatest liveries and need more representation in TSW.
That would be my dream DLC, one for Just Trains surely. Hey Just Trains, I'll happily buy you lunch if your research ever brings you to Colchester. Offer also open to other developers.