Block Signal Controller for Fiber and LED Block Signals sold by Model Train Technology . N Scale and HO 7 Light PRR Signals use FIBER. O Scale uses LEDs. If you want to light your own N or HO Scale 7 Light signal that has LEDs, choose the LED Version USE THIS PRODUCT TO LIGHT THE PRR AND LIRR BLOCK SIGNALS Remember to chose a Mounting Bracket. Signal Controller Manual v1.6a
