The bed tracked up/down stage, the door tracked stage left/right; Using manual winches with knives & dogs. The rigging intersected at center
Intersecting knife tracks for the tracking wagons.
Stage left/Stage right wagon turnaround pulley
Upstage/Downstage wagon turnaround pulley
Intersecting knife tracks for the tracking wagons.
Winch and rigging for the door unit.
Winch and rigging for the upstage/downstage wagon