The locks were opened and closed by a pneumatic ram mounted under the board as shown. It was so long ago that I can't really remember what all the wiring did, however, I think that there was a micro switch that gave a signal if the gates were open or closed and didn't allow the next process in the step to happen if the switch wasn't closed. Various other circuitry and chips controlled the paddles on the gates and provided an audible warning if there was a fault with the operation.
As with these school projects, I got pretty bored come the end - far more emphasis on the 'journey' of design than actual engineering, but it got me an A* so I can't complain!
The Engineer.
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