best type of ballast for railway line,Track ballast - WikipediaTrack ballast forms the trackbed upon which railroad ties (sleepers) are laid. It is packed between, below, and around the ties. It is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure. This also serves to hold the track in place.best type of ballast for railway line,Railroad Ballast - American-RailsIf the railroad track did not have a sub-ballasting system, or very poor one at best, the rails and railroad ties would eventually become water-logged and fail (causing a derailment, or worse, a washout). According to Brian Solomon's book Railway Maintenance, The Men and Machines That Keep the Railroads Running, today.