I have a route that I created many versions ago and now have updated for TS 2022.
I have lots of trains that are controlled by AI. They run from one passenger station to the next. In many cases the command line looked like <station1> <load> <station2> <load> etc. There were many signals between the stations. I found that if a (train a) was between stations 1 and 2, then a (train b) in station1 would not proceed to station2 until the (train a) had cleared the station2.
I solved this issue by putting a track mark close to station2, so my new command line read like <station1><load> <track mark><station2><load>. This solved my problem of AI trains just sitting there for a while and then all of a sudden starting up again.
I have other routes where an AI train just sits there for a while and then starts up again. My thoughts are that switches and stations may somehow make a distant track mark "invisible" to the AI driver. In those troublesome routes I am going to insert additional track marks along the way, especially if the are many switches and stations to see if this solves some of the problems with the AI driver.
It certainly fixed my one route. I have run it for 3 consecutive hours without any AI issues.
I have lots of trains that are controlled by AI. They run from one passenger station to the next. In many cases the command line looked like <station1> <load> <station2> <load> etc. There were many signals between the stations. I found that if a (train a) was between stations 1 and 2, then a (train b) in station1 would not proceed to station2 until the (train a) had cleared the station2.
I solved this issue by putting a track mark close to station2, so my new command line read like <station1><load> <track mark><station2><load>. This solved my problem of AI trains just sitting there for a while and then all of a sudden starting up again.
I have other routes where an AI train just sits there for a while and then starts up again. My thoughts are that switches and stations may somehow make a distant track mark "invisible" to the AI driver. In those troublesome routes I am going to insert additional track marks along the way, especially if the are many switches and stations to see if this solves some of the problems with the AI driver.
It certainly fixed my one route. I have run it for 3 consecutive hours without any AI issues.