Got a mess cleaned up and starting on a graphics add-on for the laptop. Kind of a 'sense I have to have the information to control the trains, why not display it?' Might help with troubleshooting while developing the control program too(?). This is a schematic of the TrainThing similar to the one in the simulator, but nicer.
Started the graphics build with PyCairo. Looked good. Simple. But seems the only output is to a file, which is how the simulator using PHP does it. This does create several timing/response issues, besides not being very elegant. Restarted with Vpython. Output is to a browser window. Much more involved but looks good. Has capabilities way beyond what I want to use (I think).