I never had much time for MS Train Simulator - until Open Rails came along, with much improved rendering and on denser routes, at last pretty well eliminating the awful stutter at regular intervals, as the next block of terrain and scenery was loaded as you drove the route. Route add-ons are now a regular purchase, and great value too.
Some pics from some of these, and some freeware or stock routes and items...
European Bahn's 'East Coast Express part 1' with the superior 'swallow' livery Class 91 available from UKTrainsim, swapped for the stock version:
I THINK this is the SMJ route witj a BR ex-LMS Stanier 'Black 5', all from UKtrainsim.com:
This is the London South East route by Making Tracks, possibly the best developer of commercial UK routes for MSTS:
La Belle France, an exceptional freeware route available on the 'net and a delight even for non-SNCF fans:
Irish Enterprise North, by Making Tracks:
Dorset Coast V.6, a particularly good freeware route from UKtrainsim.com:
Great Eastern, another particularly good route from Making Tracks:
Not sure whether this is the stock Marias Pass route, or the freeware MP5 version:
Irish Enterprise North again, this time at Belfast Central, recently re-named Belfast Lanyon Place:
London South Coast - the Series by EB, with the EMU from UKTrainsim.com, IIRC
London South East from MT again:
This fictional Cercanias y Grandes Lineas Spanish route features an older type of Cercanias 'shuttle' EMU:
This is Mid-East UK, freeware from UKtrainsim.com, since superceded by an even better version, Miid-East plus:
This is the stock North East Corridor MSTS route:
And this is another shot from the EB London South Coast - the Series, complete with animated traffic coming into Gatwick: