Although some may argue that there is already enough British content, i would love to see recreations of defunct BR Classes of locomotives and MUs that can no longer be seen in reality. To experience these would be awesome as so many were scrapped for simply being non standard types. For now we only have photos and very little video footage of them in service along with written accounts of their lives which in some cases were short.
Locomotive classes with no surviving examples are... 13 Tinsley master and slave shunters 16 21 22 Baby Warships 23 Baby Deltics 29 41 original Warships 53 Falcon 70 original 2 SR electric variants 74 DMU and DEMU classes are... 105 106 111 112 113 120 cross country dmu 123 cross country dmu 124 transpennine dmu 125 126 128 Parcels dmu 129 Parcels dmu 130 Parcels dmu 151 prototype Sprinter 204 demu 206 demu 210 prototypes 251/261 Blue Pullman EMU (ac and dc) classes are... 301 304 305 310 316 370 APT-P 402 413 418/0/1/2 424 432 445 4PEP 446 2PEP 457 460 485 486 487 505 506
It would be nice to see some EMUs in the game which have no surviving examples. Off the top of my head, I can think of a few classes I'd like to see: 506 - Woodhead 1500V DC units 505 - Altrincham 1500V DC units 503 - Bury 1200V DC units (one unit does survive and is being restored, but I do think they'd be a great to see with their unique side contact third rail) 501 - North London Line 650V third and fourth rail units. Tyneside 600V EMUs of any period (as I think it's a shame that BR de-electrified the tyneside network which led to its decline, so to have it brought back to life in TSW would be excellent)
With these trains it would be near impossible to get any kind of reliable reference resources to accurately model them.
There are some reference sources around and there might even be some operational staff still able to help too. But the longer you leave it, the harder it will become to do.
That'd definitely be the major difficulty in recreating them. With any luck, the original technical drawings may still survive in archives but high quality sounds would be very difficult to get, not to mention getting the handling of the loco correct. But this has been done before in Train Sim, with the class 506 being made for the Woodhead route, so it's not entirely impossible.
Sounds would be the main issue. Just look at the debate over the years about what the (proper, original) Blue Pullman units sounded like.
The engines used were (i believe) the same as in class 22 and 41 Diesel Hydraulic locomotives. There is a society currently attempting to scratch build a class 22 with a surviving power unit. Also another society attempting to scratch build a class 23 with a salvaged power unit but this group seems further along with the project than the former.
