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HO semaphores were actuated by the stretching of a hot wire many, many years ago.  The Model Railroader had an article but can't remember neither author nor date.  Some interlockers where I worked, the semaphores were controlled by motors and did move slowly; switches never moved quite that slowly, though.At armstrong towers, the levers had to be jerked hard and quickly to position the points properly, otherwise the interlocking would not get accomplished thus keeping the signal lever locked and unmovable.  As in golf and baseball, follow-through was quite important! Art
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