92 Ill. Adm. Code 1500.220
Low Passenger Platforms
Section 1500
Section 1500.220 Low
Passenger Platforms
Passenger platforms not higher
than 8 inches above the top of rail may be constructed and maintained with
faces not less than 5 feet 1 inch from the centerline of an adjacent track.
Passenger platforms less than 4 inches above the top of rail may be constructed
and maintained with faces not less than 4½ feet from the centerline of an
adjacent track.