NSE! That'd be nice, and would look great, though I'm afraid I have a steam/SR electric bias! Add to that LUL too... A class 50 thrashing up the bank with your head out the first coach window would be something really very special!
East Coastway eh?! I'd possibly suggest that the East Coastway from Hastings - Brighton (Including the Branch Lines) then the West Coastway to Bognor Regis would be a good, rather picturesque, route. Rolling stock would be easy as Class 377's and Class 313's are pretty well all that can be found on the Coastway (I know it well, and indeed use it regularly!), with 158's being the only deviation on the GWR Portsmouth - Brighton - Bristol TM/Great Malvern services. Obviously there's the 700's and 387's at Brighton (No 319's or 442's now.

) but I expect 313's and 377's would be all that's needed.
If the route was to be Southampton - Brighton West Coastway then Brighton - Seaford East Coastway (One route, though they aren't directly joined) then it might be a bit more interesting on the freight side, as passenger trains do get rather boring after a while. If that was the route then I'd suggest stock to be the Class 313, Class 377, Class 450 and Class 66 with Mendip Stone Wagons (For the infrequent Chichester Ballast Flows) Container Flats (For working into Southampton Docks) and Network Rail JNA's (?) for the Sunday Engineering Workings. Then offer classes 444, 158 and 387 as expansion packs if TSW can manage those, and then The Portsmouth Direct, London - Brighton and South Western Mainline could all reuse parts of the route and the stock, and possibly be combined together. Add in the East Coastway all the way to Ashford Itnl and you've got one big route onto which the rest of S.E. England can be built!
So, a modern stocklist!
Southern Class 313 EMU (Southern 'Coastway')
Southern Class 377 EMU (Southern 'Standard')
SWT Class 450 EMU (SWT Blue)
GM Class 66 (DBS Red, EWS Maroon/Gold, Freighliner Powerhaul and many more...)
Modern Wagon Stock (Engineers, Stone & Containers)
If a period option was offered (Or several!) then I would suggest the following:
1980's:
4-CIG EMU (NSE & B/G)*
4-BIG EMU (NSE & B/G)*
4-EPB EMU (NSE & B/G)**
2-EPB EMU (NSE & B/G)**
2-HAP EMU (NSE & B/G)**
Class 33 (Dutch, NSE & Blue)
Class 73 (Dutch, NSE, I/C, LL Blue & Rail Blue)
Class 47 (ALL Period LIVERIES!!!)
MK1 Coaches*
Container Flats
MK1 Parcels vehicles*
Ballast Hoppers & Ballast Brake Van
* Shared Components, Coaches & Physics
**Shared Components, Coaches & Physics
1960's
2-BIL EMU*** (BR Green)
2-HAL EMU*** (BR Green)
4-SUB EMU (BR Green)
Ex-LBSCR C2x 0-6-0 (BR Black)
Ex-LSWR M7 0-4-4T (BR Lined Black)
Ex-LBSCR A1x 0-6-0T**** (BR Lined Black)
SR N or U 2-6-0 'Mogul' (BR Lined Black)
Maunsell Coaches*** (BR Green)
BR-Built Push-Pull Coaches*** (BR Green)
SR & BR Period Wagons (N/A)
***Shared Components, Coaches & Physics
****If Hayling Island Branch is included
1930's
Note: Based on Seaford - Bognor Regis (Including closed branches) to maintain a reasonably low level of stock!
2-BIL EMU*** (SR Olive Green)
2-HAL EMU*** (SR Olive Green)
Ex-LBSCR Class D1 0-4-2T (SR Olive Green)*****
Ex-LBSCR Class C2x 0-6-0 (SR Black)
Ex LBSCR Class E1 0-6-0T (SR Olive Green)*****
Ex LBSCR Class I3 4-4-2T (SR Olive Green)
Ex-LBSCR Arc-Roofed Coaching Stock******(SR Green)
Ex-LBSCR Push-Pull Set****** (SR Green)
SR Maunsell Coaches*** (SR Green)
Ex-LBSCR & SR Wagons (SR Brown)
***Shared Components, Coaches & Physics
*****Many Shared Components
******Shared Components, Coaches & Physics
1900's
Note: Based on Seaford - Bognor (Including closed branches) to avoid having to include LSWR & SECR stock!
LBSCR Class D1 0-4-2T***** (Stroudley IEG & Marsh Umber)
LBSCR Class E1 0-6-0T***** (Stroudley IEG & Marsh Umber)
LBSCR Class D2 0-4-2***** (Stroudley IEG & Marsh Umber)
LBSCR Class A1 0-6-0T (Stroudley IEG & Marsh Umber)
LBSCR Class B4 4-4-0 (Stroudley IEG & Marsh Umber)
LBSCR Arc-Roofed Bogie Coaches (Mahogany, Umber & White and Plain Umber)******
LBSCR Stroudley 4-Wheeled Coaches (Mahogany & Plain Umber)
LBSCR Push-Pull Set******
LBSCR Goods Stock (LBSCR Grey)
*****These locos all share common parts (I think!) the E1, D1 & D2 share boilers, the E1 & D1 share all above-footplate features and the D1 & D2 share all below-footlplate features. This enables 3 locos for much less effort!
******These coaches are essentially to the same designs!
Cor that's a long list!
No need to worry about it not being high profile given the current disarray our railways down here are suffering!
The reason I've included the old stuff is because I quite like the idea of TSW being used in a way that we are able to actually experience a previous era, especially when no one or very few people are left who can remember it. Unlike previous train sims, you can walk about in TSW so can actually get an impression of what it might have been like to see that period. I can understand the wish for modern routes, but I can walk out my door and see the present day, I don't need a simulator to do that! If I want to travel on a class 313 (albeit not drive one!) I can go to my nearest station! But to be able to, say, travel from Brighton to Littlehampton (Before some stations, such as Durrington, were even built!) behind an LBSCR D1 at around 40MPH in a four-wheeler, would be special. Even to model the NSE era, or the 1960's. It's the same thing: experiencing the past. What does everyone else think of this idea?
Sorry for the long post! I didn't mean to ramble quite that much!
All the Best,
sem34090