The route config.txt only contains information for queries and not an actual list of all the track marks. The actual track mark information is contained in the route data itself. Because of the disparity, this makes searching for this information difficult.
Recently, I looked at the config.txt file of my small Gloucester Terminal route and found that there were track marks listed that I removed a couple of route-versions ago.
You could try the config.txt file for your session because that may query the information a bit more due to the session needing the information for driver schedules.
