I'm having a strange interaction between CTTS and train groups in Space Age. I don't know if it's because of CTTS per se, but it goes away if I disable the mod. I have uploaded a video showing the problem at https://youtu.be/SknWCQoJMLM .

Other mods installed:
Bottleneck
Factorio Library
Helmod
Orphan Finder
Parallel Research
Robotic Voice Sample for Speaker
VehicleSnap
Visible Planets in Space

Hey Tehfreek,

Thanks for the detailed report! I'm able to replicate some of the issues with just CTTS and Space Age, so it's on my end.
I'll dig into this some more and see if I can come up with a patch.

Okay, I've pushed out a patch for this issue (It shouldn't require any configuration changes after you update the mod) but if you run into any other issues please let me know.

It looks like this was happening because when the Factorio devs made some of the new train logic in 2.0 (such as train groups or interrupts) they only wanted those schedules edited through the new LuaSchedule instead of the legacy TrainSchedule. I didn't test the mod with train groups, so I missed the corner case.

Thanks again for the bug report!

Thank you for handling it so quickly!