52 Pa. Stat. § 1386
At every bituminous coal mine, where coal is mined by measurement, all cars filled by miners and their laborers shall be uniform in capacity at each mine. No unbranded car shall enter the mine for a longer period than one month without being branded by the sealer of weights and measures of the county wherein the mine is located or by the Department of Mines and Mineral Industries. Any owner or his agent violating the provisions of this section shall be subject to a fine of not less than one dollar ($1.00) per car for each and every day such car, not in conformity with this act, is used. The sealer of weights and measures or the Department of Mines and Mineral Industries, as the case may be, on receiving notice from the checkmeasurer or any five miners working in the mine, that a car or cars are not properly branded or not uniform in capacity according to law are used in a mine, then inside of three days from the date of receiving said notice, it shall enforce the provisions of this section.
52 P.S. § 1386