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The opening ends have folding doors with diagonal timber running to an overhead track running to compact brick pylons at each end. At each end the pylons are in the form of a square shaft. That of the NE corner of Building 78 is modified, being larger in plan, with an open arch to the N side, a corbelled arch to the W, and carrying a brick box superstructure approx 3m high, with flat concrete slab roof. (Photo Oct 2012).