(225 ILCS 710/45.45)
(from Ch. 96 1/2, par. 4298)
Drifts used as manways intersecting overhead workings through which material is dropped shall be closed to the passage of persons by a
substantial rail not less than 3 1/2 feet nor more than 4 feet in height
above the level of the drift, on each side of the working, whenever
material is to be dropped through such working, and the drift shall be kept
so closed during the period when the working is so in use.
(Source: Laws 1945, p. 1035.)