Some help or pointers please. Instead of just "making it up as I go", and just wack a signal here and another there, to look pretty, I want them to mean something, and eventually operate. I have no idea where to start. No even the knowledge whether a signal "up" means go or stop! or turn left here, or go through this and crash there! Is there a easily accesible article, web etc that can give me info? Is signal structure positions, colour etc universal? or railroad specific? This post will keep me busy for a while! Thanks in advance for help.