2 x ho railroad grade crossing signals 2 tracks + 1 circuit board 2 x ho scale railroad crossing signals led flashing + circuit board $1.00 crossing flasher circuit kit w/pcb
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Rail Road crossing Flashing LED using 555 IC ~ Electronics Hotspot
MODEL_RAILROAD_CROSSING_FLASHER - LED_and_Light_Circuit - Circuit
Railway Bob's Module Building Tips: March 2012
Grade Crossing Flasher with Three Rail Detection
1 set N Scale Railroad Crossing Signals 4 heads LED made + Circuit
4 x HO Scale Railroad Crossing Signals 2mm LEDs made + 2 Circuit board