Reply to ""flip flopping" a switch"

dual coil latching relay method

The trick is the "memory" function of a latching relay.  That is, you only need to momentarily trigger the relay to change its position and it remembers the new position even after removing the trigger (voltage).  In general a latching relay has a "set" input and a "reset" input.  In this example, when the trolley runs over the A insulated section, it sets the relay.  When the trolley runs over the B insulated section, it resets the relay.  When the trolley runs over the C insulated section, it applies power to the switch machine to toggle the direction.  That is, if the trolley last hit the A section, the relay will be set to apply the C trigger to change the switch to the B position.  If the trolley last hit the B section, the relay will be reset to apply the C trigger to change the switch to the A position.  That is how it alternates.

What's subtle is what Elliot described in one of his posts.  The latching relay is toggled when the trolley enters the A or B section.  You cannot have the relay toggle from the C section.  Why?  Because you can get multiple triggers from dirty track!

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