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Close to the shaft doors can be seen a simple safety catch designed to prevent the inadvertent movement of mine-cars back towards the shaft. It consisted of two steel arms which pivoted so as to allow them to swing away from the shaft only. They were pushed aside by the off-loading mine-car and then pulled back into position by springs.
At the side of the track, just beyond the catch was a pneumatic interlock valve with a projecting flexible arm. This was activated by the unloading mine-car and locked the decking operations until the mine-car was clear of the doors.
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