That is all PTA said about their train despawning issue. This has become a big problem for everyone. This problem is preventing people from driving ANY train from point A to point B. As stated in the group shout, they are unable to do anything about it. 

Trains just randomly despawn mid-ride. I made a video about this happening. Check out the embed to the right or click here to see the video. The video has more details about this issue. 

I have no idea or update on when this annoying major bug will be fixed. 

The only solution: Recording on a private server. 

I'd like to explain how this solution works: If you idle for too long in a public server or stay in a station too long, it will automatically despawn you. It can also sometimes despawn you if it detects a crash or derailment on your train. In a private server, there is none of that. Your train will NOT despawn for no reason unless you hit the delete button on the train controls; that is the only time the train is allowed to actually despawn. That means under normal conditions, the train should be able to not despawn even if an idle is too long or even if it detects a crash.