Boring for a blast in the depths of a coal mine, Pittsburg, Pa., U.S.A.

A loaded coal train and the gravity incline at a coal mine, Pittsburg, Pa., U.S.A.

Miners pushing an "empty" (sides of tunnel show depth of coal vein), coal mine, Pittsburg, Pa., U.S.A.

Abandoned or ruined railroad tracks at Hollywood Colliery.