AmericanSteam wrote:Resellers.
That's the short answer -- the long answer is that Trainsim.Store is what was originally Trains & Drivers, who started out as one of the pioneers of creating and selling scenario packs and custom equipment for Railworks (yes, the game was actually still called that when they started.) That included many in-house creations by Andreas and team, but also stuff from other 3rd party folks like myself.
A few years ago, Andreas moved on from train sim and handed the reigns of the store over to the owner of 3DZug, who was (and I think still is) running his own store, too.
Cheers,
Michael