Cute Young Brunette Girl With A Green Scarf On The Railway Track

Timber sleepers (ties) may be of hardwood or softwood, and are customarily treated with creosote or other wood preservative. Pre-stressed concrete sleepers (ties) are often used where timber is scarce and where tonnage and/or speeds are high.
The track ballast is customarily crushed stone, and the purpose of this is to support the ties and allow some adjustment of their position, while allowing free drainage.