One of my first thoughts but actually wrong.If a second train follows the first is would put the first signal to red whilst the first train was between the second and third signals and the second signal would be red, two reds. I could have a train in each section - four reds.
sembazuru,Are you saying have a chip at each set of signals?The idea of four wires sounds good.The furthest signal is about 200 yards from the place I want to put the central hub.The switches are close to each signal head.
yea dc42 thanks for the reply.do you know how to wire and prog a I2C system? would it be much beyond basic uno programming?I've never gone that far .
This would definitely be something that would need to be prototyped and tested thoroughly. So... what is your R&D budget? (rhetorical question...)