Yep i meant upgrade 2 lane in 4 lane system. Looks like you added red wires? Well done! Here you can find some pictures: http://imgur.com/a/qhzsA 0eNrtne9uXUl23V9F0Megr1H/q84gDhA4geHMxAOMJx+SwGio1XQ3MWqpQUkTjw2+SYC8Qh4gn+IXCynxXl5StU+t36lzZ9qZ/mJ4KHJ1/TtVu3attfY/v/zmzcerH2+u3374+pt373738hf//PiT9y9/8...

i cutted some rails, and changed the signals, to make it 4 belt compatible. Still under work. 2 Lane belt so far is finished.

Edit: i realy like your intersections (45°)

should i post some images and blueprints?

Very Nice Blueprint book.
I merged this book and my self made train network. I added to your book some lamps, green and red circuits. Also improved for easy 4 line upgrade. 2 Rail System is done, 4 belt under work. Should is post some pictures and blueprints?