2R13 is in sim at when it shouldn't be

This one is down to your previous post https://www.SimSig.co.uk/Forum/ThreadView/50310

2R13 has a rule not to enter until 2U06/P42803 leave the area so after you removed or had 2U06 leave the area 2R13 is then free to enter the sim, you may also find that you have other trains that will enter the sim late as a result of this.

MarkC in post 122006 said:

This one is down to your previous post https://www.SimSig.co.uk/Forum/ThreadView/50310

2R13 has a rule not to enter until 2U06/P42803 leave the area so after you removed or had 2U06 leave the area 2R13 is then free to enter the sim, you may also find that you have other trains that will enter the sim late as a result of this.

Oh dear. Looks as though I'll have to go back to a previous save then. I did ask if it would be all right to delete 2U06 and as the question wasn't actually answered, went ahead and deleted it anyway.
Oh well. Learnt the hard way :/

And after 2R13 has run through you may well find that there is a rule telling another train to enter x minutes after 2R13 has left the area (and then another ruled to that train etc. etc.)

As you have found out, just removing the train doesn't break the chain so everything downstream will continue to enter. If you go through the rules in the TT you can work out which trains form the chain. The easiest way is to go to the Rules tab in the TT, select the sort by 2nd. train option and look for 2R13. If the correct 2R13 and whatever UID it bears is in the list, then the other train in the rule will be due to enter x minutes after 2R13 has left. Note that TD/UID then go to the Timetables tab, click on that train then click on the "Mark (un)entered" button. This will set the TT to show that the train has already entered so it won't follow on from 2R13. Anything further down the chain won't enter as the train in the rule governing its entry will not have run.

So far, so good.

But you've now got to 18:30 and the likelihood is that you will soon have a gap in the TT where a train that is part of the chain downstream of 2R34 will be due to enter. If you want to get back to running an accurate TT with no cancellations due to staff shortages, breakdowns or SimSig TT errors you are going to have to follow the chain to see if you do have an imminent entry then work out how to inject that train into the sim. What might be the easiest way to do that?