The hand wheel rotates a vertical shaft by means of bevelled gears. The bottom of the shaft in the signal box basement drives rack and pinion gears that connect to rods that move the gates via cranks in the same manner as turnout control. In addition road and rail side gate stop locks and wicket gate locks are controlled similarly.
At Hewish Gates in the 1930s the cranks and rods outside of the crossing area were covered by boards. By the 1950s the boarding appears to have been removed exposing the mechanics. I have modelled the boards in place to save modelling the mechanics. I only had to show rods where they cross the open track bed.
In the prototype there are more mechanics under the road surface that were accessed by removeable panels but most of the road was an asphalt covering over wooden boards, judging from photographs.
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