The bug occurs at the junction near Birningcaster Tye. The next train coming from Birningcaster Tye will slow down to 1 km/h and proceed in drive by sight at the policeman placed at the exit of the junction.
.sve: https://drive.google.com/file/d/1JcTHqeVFtS_ASa7-NylNW4vVrwauGcH1/view?usp=sharing
Thank you for your report. I can confirm that I can reproduce this. I will have to look into this when I return from my holiday.
I think that I have now managed to fix this - I should be grateful if you could re-test with to-morrow's nightly build.