Sand and ballast don't mix – Rail EngineerApr 22, 2014 . Although ballasted track remains the conventional method of constructing railway lines, the system is susceptible to ballast contamination in.sand ballast in railway trakcs,Why are there crushed stones alongside rail tracks? - QuoraThis is a good question with an interesting answer. The crushed stones are what is known as ballast. Their purpose is to hold the wooden cross ties in place,.