BTW guys, all the signal heads from these and a few other bridges are available for purchase. I have something like a dozen. I will be building my own signal heads and masts, using these targets from We Honest, and 5mm bi-color LED's.
I'll also be working with forum member Scalerail (Don) to do some of the free standing signals. He has a 3D printer and the design to do bases, platforms and ladders to do something like this.
The reason I bring this up is, he suggested that I use the Plasticville bridges because they are scale, and I have picked up a couple off the bay this week. I worry that they are too delicate to cut, splice and carry weight like the 450. I'm willing to forego a little scale accuracy on this project, in favor of something rugged.
