Question About The 'in-game' Map

I've noticed this every time while looking at the map, but I can't hold my curiosity anymore -



These orange lines represent the playable tracks.
Light Blue line is the path for player's train.

What are the remaining Red & Dark Blue lines used for ? Do they represent anything ?

 

Those are the clogged arteries and we have to operate soon, doctor.

No, but really, I wish the map was finished, should look like the map in TSC.

 

I think red is normal track, dark blue or orange are sidings and light blue is used for both player path and stations.

 

Red i think is mainline and branches amd light blue is path's and like you said stations

 

Not something I’d ever really thought about until I read this thread. Nice to know now though. Thanks

 

Thanks Matt !