Concrete Sleeper

A concrete sleeper is a railroad tie made out of steel reinforced concrete.

Read more about Concrete Sleeper:  History, Types, Advantages, Under Sleeper Pads, Disadvantages, Alternatives, Manufacture, Transport, Installation, Oldest, Turnouts, Problems, Inventors

Famous quotes containing the word concrete:

    “There can be no difference anywhere that doesn’t make a difference elsewhere—no difference in abstract truth that doesn’t express itself in a difference in concrete fact and in conduct consequent upon that fact, imposed on somebody, somehow, somewhere, and somewhen.”
    —William James (1842–1910)