Block signal
Block signal Block signal (Railroads) 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. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • block signal — noun also block signal system : a fixed signal at the entrance of a block to govern railroad trains entering and using that block compare block system 2 * * * block signaling. a fixed railroad signal governing the movements of trains entering and …   Useful english dictionary

  • block signal — block signaling. a fixed railroad signal governing the movements of trains entering and using a given section of track. [1880 85] * * * …   Universalium

  • block signal system — noun see block signal …   Useful english dictionary

  • Automatic Block Signal — Basic Automatic Block Signals = Automatic Block Signal, or ABS, systems consist of a series of signals that govern blocks of track between the signals. The signals are automatically activated by the conditions of the block beyond the signal.… …   Wikipedia

  • automatic block signal — noun : a railroad signal at the entrance of a block actuated automatically by and governing the movement of trains entering and using the block …   Useful english dictionary

  • distant block signal — noun see distant signal …   Useful english dictionary

  • Block (telecommunications) — In telecommunications a block is one of: * A group of bits or digits that is transmitted as a unit and that may be encoded for error control purposes. * A string of records, words, or characters, that for technical or logical purposes are treated …   Wikipedia

  • Block Automatique Lumineux — Pour les articles homonymes, voir BAL. Signal permissif de BAL, sur la ligne du RE …   Wikipédia en Français

  • Block Manuel — Pour les articles homonymes, voir BM. Signal lumineux en block manuel sur la ligne Grenoble Montmélian …   Wikipédia en Français

  • Block automatique à permissivité restreinte — Signal d entrée de canton affichant la voie libre sur la ligne de Serquigny à Oissel. Le Block Automatique à Permissivité Restreinte, ou BAPR, est un système de sécurité ferroviaire utilisé sur les lignes à trafic moyen. Pour mémoire, les… …   Wikipédia en Français

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