The route that I use is a loop.
Hi Red - Welcome to the forum and the wonderful world of Trainz. Real trains don't usually run around in circles, A to B running is much more typical. That said, you can still model a closed loop by taking some extra precautions.
When you map a closed loop you are bound to have problems with a train "seeing" another train ahead of it and refusing to move. It is essential to place a
junction between stations so that the track is divided into sections. Using a passing loop at a station will help this problem, giving a train an alternative path to use if the one in front is occupied. You may need more than one such diversion. Instead of a passing loop you can use spurs (dead-ended sidings) and set the junction to deviate. This prevents the train behind from seeing the train ahead and reporting "track occupied by another train".
Place a trackmark before the junction and instruct the driver to Navigate to that trackmark. When he arrives, let him go on to the next trackmark. The junction will switch and if the track is clear, proceed.
Another thing you might find is that a train goes in the wrong direction, especially noticable when there is only one train. Place yellow direction markers to indicate the desired direction of the train. They are in the third panel of the Track pull-out menu, along with the trackmarks.
And follow the advice of the previous posters as well.
Cheers - Trevor
