This route is by Dovetail Games. You can find it here: https://store.steampowered.com/app/325960/Train_Simulator_Riviera_Line_in_the_Fifties_Exeter__Kingswear_Route_AddOn/
(Fictional). Take a local service from Newton Abbot along the branch to Heathfield and back using as 57xx 'Pannier' tank engine.
A great 'starter scenario' for those just getting into 3rd party DLC. It comes in 2 simple, 15 minute parts and uses all default stock.
Difficulty: Easy
Requirements:
Just the route!