Oh ok. It was quick drive, no scenario, so it used the default train for that route. Also, if you're wondering how I got AI in quick drive, I installed a mod from the workshop, can't remember which one.
Thanks. Both of the images are from quick drives but only the Chatham mainline has ai traffic so that might be one to look at as well as I can use the 158 and 377 on the Portsmouth Direct line as that does not have any ai quick drive traffic.