If you put 'Edinburgh Glasgow' into the search box on the Steam store page, it will list the packs for the original version of this route. Check each pack description to ensure that it is intended for the Edinburgh- Glasgow route. Note that there is also a fully electrified version of the route which can use additional packs: https://steamcommunity.com/sharedfiles/filedetails/?id=528927016&searchtext=Edinburgh+Glasgow+route
The one thing about this game is almost everything is compatible. The Edinburgh - Glasgow line used to be worked by the Class 170 that comes with the route Before that Class 158 units were the norm. Before the 158s trains were Loco Hauled with Class 47s and a DBSO (coach with a Driving cab) And the old classic traction used to be two class 27 diesels with 6 Mk2a Coaches Push - Pull mode It is possible to replicate any of these in the game and you can run almost anything you wish There are a number of scenarios on the Workshop that use different trains See if there is something you like https://steamcommunity.com/workshop/browse/?appid=24010&requiredtags[]=Edinburgh+-+Glasgow Peter
