The vast majority of them are build 3.6 (TS12) and have screenshots that show an unusual UI - not from TS12. I suspect they are all saved Android routes and/or sessions that were under development by various users. Back then the DLS was, I believe, the only place where they could be saved. This was the source of many complaints.
As to the current Android version (Trainz 3), there was a very long time gap between the earlier (TS12-like) version and the release of Trainz 3. I do know that Trainz 3 was in development during that time as I was asked if they could use one of my routes in the "new" version several years ago - around the time that T:ANE was released if my memory serves me correctly (a rarity these days!).