PlayStation What Do The Map Colours Mean?

The tsw2 map is wonderfully colourful. I know my own route is the light blue line but does anyone know what all those purples oranges and whatnot stand for?

 

Line Blue~Train Station
Other Line Blue~Your path
Red~Train Tracks
Yellow~Sidings & Yards
Purple~Train wash or some random track

 

Thanks for that, another mystery (for me) solved.

 

Purple sections are targets for trains to travel to or stop at, and exist purely for the setting up of scenarios and services (by the devs), and there might not be anything there other than track on the real route.