The Coal Mines (Certificates of Competency) (Copies) Order 1950
EXPLANATORY NOTE
(This note is not part of these regulations, but is intended to indicate their general purport.) These regulations make the following modifications in the Coal Mines (Locomotives) General Regulations, 1949, for the purpose of their application to ironstone and oil shale mines:—
(a) if no locomotive in the mine weighs more than [UNCLEAR: '3½'] tons, the weight of rail in tracks may be 24 lb. per yard instead of 40 lb. and sleepers may be 3 ft. apart instead of 2 ft. 9 in.;
(b)...