You can download all his sessions and run them. They are big passenger sessions on the routes in Cornwall. If you want, add in your own commuter train and run that yourself while the AI are driving other trains. It may take some time to set it up but it can be done relatively easily and it's quite fun to do that. Besides, seeing other traffic running at the same time while you're driving makes the sessions more realistic instead of seeing only a single train or two running.