I have heard about these but I haven't been playing TS for long enough to play them and I'm not sure exactly what they were. Could someone explain it to me? As far as I know they were normal scenarios that were played in stages, with different players completing different sections in sequence - but I could be wrong.
A number of scenarios were made in the past before routes were joined together I remember an East Coast run where you drove in order Kings Cross to Peterborough on ECML South Peterborough - York on Y2P Modern York to Newcastle on Yrk-Ncle Modern Newcastle to Edinburgh on the JT route. The formation of the train used was the same in each section
They were a sort of multiplayer content, introduced with TS2013, you'd load up a scenario, drive part of a route, check your score, then you'd save and offer one of your steam friends playing TS to continue the run, and see if their score was better than yours. IIRC they were hyped no end when introduced, then around TS2016/TS2017 they were dropped without much notice
Just a savegame swapping adventure, nobody really needed that. (Note that a Career savegame cannot be swapped, playing it as a different Steam user your score will be -1000000) Marias Pass comes with one, Hauling the Harvest Grain which can be played as a normal Standard scenario (it's compatible yes) - but it won't appear in the Drive tab. You have to go to Build>Scenario>Marias Pass>Hauling.., press Edit then Play. Or convert it using TSTools.
Yes, most of the scenarios are still there, there was one for the London Brighton route too I think, and Munich Augsburg (I think Marias Pass, London Brighton and Munich Augsburg were the "default" routes in TS2013)