§ 33.117. Mine railways and motor haulage.

 (a)  When motors are used in a mine, their speed shall not exceed 6 miles per hour, except in approved portions of mines where a speed of not more than 15 miles per hour shall be permitted. Illuminated signs shall be used to indicate those portions of a mine in which the Department has established a six-mile-per-hour speed limit.

 (b)  Each motor shall have an efficient headlight and an efficient horn, siren, or gong which shall be maintained in good condition at all times. There shall be an efficient trip light on the rear end of all motor trips. There shall be an efficient trip light on the front end of made-up motor pushed trips of three or more cars and on the front end of all cable trips except slopes or planes where men neither work nor travel during working hours. Trip lights shall not be required in switching service.

 (c)  No fired locomotives, or internal combustion motors shall be permitted in any part of any mine, either in the inlet or outlet airways, unless permission has been granted by the Board.

 (d)  The placing of additional internal combustion motors in mines or tunnels for underground use is prohibited unless permission has been granted by the Board. This requirement shall not be construed to prohibit the use of spare equipment in breakdown or emergencies.

 (e)  No mine car shall be used in any mine unless the bumpers are of a length and width sufficient to keep the bodies of the cars separated by not less than 12 inches with the cars standing on a straight level road and the bumpers touching each other.

 (f)  No person other than the motorman driver, runner, snapper or brakeman may ride on any car in any mine.

 (g)  No person shall ride between cars.

 (h)  Loaded cars shall be pulled out of the mines and empty cars shall be pulled, rather than pushed, into the mines by the motor or engine, whenever practicable. Running cars by gravity in any mine is prohibited unless necessary to permit the motor to get from one end of a trip to the other end.

 (i)  No cars shall be coupled or uncoupled while they are in motion; only such slight motion which may be necessary to make or break the coupling shall be permitted.

 (j)  On all haulage roads, all frogs and guardrails shall be properly blocked with wood, concrete or metal. The track shall be properly aligned and shall be free from high or low joints, broken rails, defective switches, defective frogs and defective frog point alignments.