If you have a suggestion of another method, please share it. With both the relay and the motor and fan, the power can be on indefinately without burning anything out. I simply do not have room for a slow motion switch machine. The twin coil will not work as my signal system will keep a coil energized which will lead to it burning out. The other option I am aware of is using a twin coil switch machine or a slow motion switch machine like a tortoise. I used a small electric motor with a propeller/fan to create a vacuum and used a disk secured to a L shaped fulcrum that was sucked into a cylinder shape (a spray bottle cap) this movement was enough to operate a semaphore signal.
The second method I have used before, but this time I am spatially challenged, since the signals are on an upper deck with only about 10 inch separation from the lower deck. My prototype (South African Railways) used upper quadrant semaphores, so I simply have to push the arm/blade up and keep it up till the train has passed and triggered an optical sensor to disconnect the power to the semaphore which will then reset it to danger. Use a relay, by soldering a piece of wire to the moving contact, you can then attach that wire to the actuating arm of the semaphore to operate the blade/arm. Apart from servos controlled by ardriuno or similar complex electronic devices, are there simpler ways to operate a semaphore signal? I have thought of two.
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