WM. PRESTON LANE, JR., GOVERNOR. 1051

(c) After the effective date of this act, all new side-
tracks, partings, or entries equipped with more than one
track shall have a clearance of at least 30 inches between
the outermost projection of moving traffic.

(d) The clearance space on all haulage roads on entires
driven before or after the effective date of this Act shall
be kept free of loose rock, coal, supplies, or other mater-
ials, provided that not more than 30 inches need be kept
free of obstructions.

(e) Ample clearance shall be provided at all points
where supplies are loaded or unloaded along haulage roads
or conveyors.

(f) Where it is necessary for men to cross conveyors
regularly and where the width of conveyors or low roof
introduces a hazard, suitable crossover bridges shall be
provided.

(g) Shelter holes shall be provided along haulage en-
tries driven after the effective date of this act where loco-
motive, rope, animal, or shuttle-car haulage is used.. Such
shelter holes shall be spaced not more than 80 feet apart.
Except where the trolley wire is G1/^ feet or more above
the rail or guarded effectively at the shelter holes, they
shall be on the side of the entry opposite the trolley wire.

(h) Shelter holes made after the effective date of this
act shall be at least 5 feet in depth, not more than 4 feet in
width, and 6 feet in height or as high as the traveling
space, if the traveling space is less than 6 feet high. Room
necks and crosscuts may be used as shelter holes even
though their width exceeds 4 feet.

Shelter holes shall be kept clear of refuse and other
obstructions. Shelter holes shall be provided at switch
throws, except where more than 6 feet of clearance is main-
tained and at room switches. At each landing of a slope
where men are passing and cars are handled, a shelter
hole at least 10 feet deep, 4 feet wide, and 6 feet high
shall be provided.

92. Haulage equipment. Non-permissible internal-com-
bustion engines or other machinery which gives off noxious
fumes shall not be permitted underground in any coal mine.

93. Safety devices and practices, (a) Locomotives shall
be equipped with proper devices for the rerailing of loco-
motives and cars.

An audible warning device and headlights shall be pro-
vided on each locomotive.