HARRY HUGHES, Governor

1369

(b)  On the trolley wire or "tight" side, there shall
be sufficient clearance to prevent the farthest projection
of moving equipment from rubbing or coming in contact with
ribs or timber.

(c)  Any new sidetrack, parting, or entry equipped with
more than one track shall have a clearance of at least 30
inches between the outermost projection of moving traffic.

(d)  At least 30 inches of clearance space on an entry
to any haulage load shall be kept free of obstructions of
loose rock, coal, supplies, or other materials.

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

(f)  Suitable cross-over bridges shall be provided
where necessary for any person to cross conveyors regularly
and where the width of conveyors or low roof introduces a
hazard.

(g)  (1) Shelter holes shall be provided along haulage
entries driven where locomotive, rope, or shuttle car
haulage is used. They shall be spaced not more than 80 feet
apart. Except where the trolley wire is six and one-half
feet or more above the rail, or guarded effectively at the
shelter holes, the holes shall be on the side of the entry
opposite the trolley wires

(2)  Shelter holes 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.

(3)  Shelter holes shall be kept clear of refuse
and other obstruction. They shall be provided at switch
throws, except where more than 6 feet of clearance are
maintained and at room switches. A shelter hole at least 10
feet deep, 4 feet wide, and 6 feet high shall be provided at
each landing of a slope where men are passing and cars are
handled.]

[7-419.

Any nonpermissible internal-combustion engine or other
machinery which gives off noxious fumes is not permitted
underground in any coal mine.]

[7-420.

(a) Locomotives shall be equipped with devices to
rerail the locomotives and cars. An audible warning device
and headlights shall be provided on each locomotive.