Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fixed signal at the entrance to a railroad block, indicating whether or not trains may enter.

from the GNU version of the Collaborative International Dictionary of English

  • One of the danger signals or safety signals which guide the movement of trains in a block system. The signal is often so coupled with a switch that act of opening or closing the switch operates the signal also.

from The Century Dictionary and Cyclopedia

  • n. An automatic signal placed at one end of a section of a railroad to block the section by warning trains coming into it of the presence in it of another train.

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