This company is selling Steam Keys or the different routes https://www.instant-gaming.com/en/search/?query=train simulator 20 If you need a route this might be cheaper than buying it separately Peter
Just on the back of this - click the links below to see what each edition includes. 2014 - https://steamdb.info/sub/32825/apps/ 2015 - https://steamdb.info/sub/69483/apps/ 2016 - https://steamdb.info/sub/94143/apps/ 2017 - https://steamdb.info/sub/152377/apps/ 2018 - https://steamdb.info/sub/215404/apps/ 2019 - https://steamdb.info/sub/306681/apps/
If you buy one of these older versions you get a Steam Key which you redeem via the Steam Client. You do not get another version of Train Simulator but all the locos/routes etc from that pack do go straight in to your Library. Peter