working rail

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fly rail, pinrail, working rail

In a theater stagehouse, a railing on the stage side of the fly floor; used for tying off lines when scenery is hauled into the flies.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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One of the great attractions is a normal working rail service.
But Speyer also hinted at why his firm might have gotten cold feet on the multibillion-dollar project to build millions of square feet of commercial and residential space on top of the working rail yards--a titanic development that many real estate experts said would be difficult to finance and fill in the current economic downturn.