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Here's an idea for converting the movement of a moving train to rotational motion track side. This is shown in set 6991: The mechanism in this case is a tire hanging from a universal joint so that it engages the train without interfering too much: This core idea could be mechanically adapted for other purposes, such as the 180 degree rotation that you are ...


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If I understand the problem correctly, you have a track, on which something is moving in a straight line. Then you want to have another, stationary object to rotate when the moving something has passed a certain point on the track, right? Like a semaphore transitioning to another state after a train has passed a switchpoint? If so, then the simplest solution ...


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