Saw this is released but only available from Rivet store and not steam https://www.facebook.com/photo/?fbid=578370057621743&set=a.520660413392708
It's described as the SimTrain's edition and is £22.95, though it appears to come with a good collection of AI.
Available on the Swiss SimTrain site and converts to £22.08. However SimTrain have many sales where Rivet don’t. Could also be released on Steam soon. https://www.simtrain.ch/pi/Add-ons-TS2014-TS2022/Schweiz1/traverso-ts20xx.html I will buy mine via SimTrain Christmas sale or steam, but won’t be buying from Rivet.
The scenarios and route requirements are different between the Rivet and TrainSim versions. It's worth checking which is best for you.