1 CONTAMINATED RAILWAY BALLAST - Técnico LisboaThis paper provides a description of the characteristic process of environmental contamination of . 1. INTRODUCTION. Railway ballast is made of crushed stone according to the standard NP EN 13450 - . The second, which is the subject of this paper, concerns the environmental contamination of the railway ballast by.enviromental ballast granite railway,Railway ballast recycled as secondary graniteA re-use for spent railway ballast. 1 December 2011, by Gary Bell and Peter Dawes. Frimstone has found that that worn-out track ballast, hithertofore wasted as bulk fill, can be reprocessed into a sustainable form of building material that helps developers achieve re-use targets. Rail network: LDCs to ease track maintenance.