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.


Sorry, no etymologies found.


    Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.