Polaris-8  Ltd has TMSI (massive two-line crushing- washing-sorting installation). The ballast is treated by washing and sieving in the six types of aggregates for concrete and mortars with dimensions: river sand fraction 0 / 4mm,  and shingle fractions 4 / 8mm,  4 / 16mm, 16 / 31.5 mm, 31.5 / 63 mm, 0/45 mm.