I have a line with 4 stations, and once the train reaches the 3rd station, it stops and will not continue it's schedule. If you try to keep going manually, it will go, but the speed dial will keep inching down to start. i have tried clicking on the schedule item, putting in the command Drive Schedule, and stopping the train and saying continue schedule. I have had this problem in the past
There's probably something wrong with the track ahead of the last station. Turn on the messages for your driver(s) by clicking on the wrench icon and choosing Show driver messages, or whatever it's called - I'm not at my Trainzing computer to verify the exact wording.
What this will do is show a message such as no path to selected destination, junction missing lever, direction marker facing against the driver, or unable to plot route .
The cause of this is usually a broken track segment, a direction marker facing the wrong way, and as stated a junction missing a switch lever.
How to find the place?
1) Manually drive to the end of the route. If you derail, you'll find the error.
2) Open Surveyor and "walk" the route and perform an inspection along the ROW. This can be a long process as you search for missing junctions, incorrectly setup
For broken segments, check that all the track segments (spline points) are connected and level. Click on them or very close to them with the adjust height tool. That will lift up the track level and connect the segments most of the time. Sometimes when it comets to road crossings and other interactive industries such as stations, for example, the track has to be moved and connected, or deleted and reconnected.
Switch levers and reversed direction marks are sometimes elusive critters to notice. These are the type of thing that for some reason our eyes glaze over and are difficult to find. You just need to work slowly and scrutinize everything.