771. Use of locomotives below ground in regard to mines.

The consent1 of an authorised inspector2 must be obtained before any locomotive3 is used below ground4. At mines of coal, stratified ironstone, shale or fireclay the use of locomotives below ground is subject to detailed provisions with regard to the design of locomotives5; the construction of tracks, their standards of height, width6 and gradient7; the determination of the firedamp content