Lionel 12883 O Scale #148 Dwarf Signal

Place the signal along the mainline on your Lionel railroad, and passing trains will automatically cause the lights to change from green to red. Once the train has cleared the signal, the lights will change back to green.Features include: ?Lights change from green to red when train move through its block?Automatically resets to green when train clears itch block?153C Contactor included for traditional O and O-27 gauge track layouts?To activate the signal on a FasTrack layout, you can use the 153IR Controller (available separately, 6-14111)?Dimensions 1" x 1" x 2" Place the signal along the mainline on your Lionel railroad, and passing trains will automatically cause the lights to change from green to red. Once the train has cleared the signal, the lights will change back to green.