tender for supply of hard broken stone ballast 40 mm size for railway track no.10 & 11 at aip siding. , supply of hard broken stone ballast 40 mm size for railway track no. 10 & 11 at aip siding. , hard broken stone ballast 40 mm size for railway track no. 10 & 11 at aip siding. technical specification: basic quality: ballast should be hard durable and as possible angular along edges / corners, free from weathered portions of parent rock, organic impurities and inorganic residues. particle shape: ballast should be cubical in shape as far as possible. individual pieces should not be flaky and should have generally flat faces with not more than two rounded / sub rounded faces. mode of manufacture: ballast for all bg lines and running lines shall be machine crushed. note: scope of supply includes conductive, sieve test at site, and stacking of ballast in required location.