Probably the most unusual design decision that I made in my game was to not have trains specify waypoints and calculate paths themselves. Rather, I have players set the directions that trains are allowed to go at every train signal. I like this because it makes the control logic have a physical location in the map instead of being in a list in the train. Fortunately, it isn’t necessary to modify most signals because the default of every path being available to travel along is often sufficient.
The problem is that it is more difficult to understand where a train is actually going to go without some help. Therefore, I’ve added several features to highlight the routes taken, making them easie...