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railroad track ![click to hear : railroad track click to hear : railroad track](../../../images/speaker-vert.gif)
A pair of parallel rails laid end to end and on which trains run.
ballast ![click to hear : ballast click to hear : ballast](../../../images/speaker-vert.gif)
Bed of gravel that serves as the foundation for the tracks and provides drainage.
rail ![click to hear : rail click to hear : rail](../../../images/speaker-vert.gif)
Steel bar of a set gauge that is attached to ties; the train’s wheels roll along it.
tie ![click to hear : tie click to hear : tie](../../../images/speaker-vert.gif)
Piece of wood or concrete that is set in ballast and supports the rails to distribute the train’s load and keep the rails parallel.