§ 33.35. Inclined planes.

 (a)  In every pit or quarry where inclined planes are operated, blocks, derails or safety switches shall be provided at the top of every plane to prevent cars that have been hoisted from running back down the plane and to prevent cars which have been left standing at the top from running to the foot of the plane.

 (b)  At a safe point near the bottom, to be determined by the owner, operator, superintendent or foreman, the owner, operator or superintendent shall provide either a sharp curve, a blind end switch, or a mechanical derail to derail cars which have broken away and to prevent them from running into the quarry or injuring workmen engaged at the bottom of the plane.

 (c)  Nothing in this subchapter shall be construed to require the installation of a block, derail or safety switch at the top of any barney plane or where the skip or car remains on the chain or cable, or where the car passes over a hump.