(a) The minimum overhead clearance above railroad tracks which are used or purported to be used for transporting freight cars shall be twenty-two feet (22′). Structures constructed prior to April 13, 1949, may be maintained at such clearance as was lawful at the time of construction.

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(b) The overhead clearance above the top of the rail of such tracks located inside of buildings may be reduced to seventeen feet (17′); provided, that this clearance shall apply only to tracks operating within the buildings; and provided further, that when an overhead clearance of less than twenty-two feet (22′) exists on tracks inside such buildings, all cars, trains, motors, engines or equipment shall be brought to a stop before entering such buildings.