Level crossing wig wags

[Kaz]

Hiya there, long time lurker stuck in his dark ages here. Im trying to figure out how i would make some wig wags with lights. Ive posted in the train section but they will be for a fire station. I dont want to go down the mindstorms route, preferably 9v and im a complete novice with the led lighting kits to be found on ebay. Any help would be greatly appreciated. Heres an example

 

 

[Andy Glascott]

Hi, your best purely Lego bet might be to use some of the old 9v Light and Sound pieces, you'd need both this and this to get the 2 red and 1 orange lights in. The light elements fit into either a technic hole or a headlight brick so you can filter the light through trans red/orange round plates/tiles. Both have two settings built in - always on and flashing, to alternate you just turn the brick around. Power source is any 9v battery box with the appropriate connector wires, though the old 9v ones are more expensive and harder to come by. Feel free to ask if you have more questions.