(225 ILCS 710/45.47)
(from Ch. 96 1/2, par. 4300)
The top of all shafts shall be protected by a tight fence or railing, which may be provided with the necessary gates or bars to give
access to the shaft, but such gates or bars shall be kept closed when
access to the shaft is not necessary.
(Source: Laws 1945, p. 1035.)