automatic block signal


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. 2012.

Look at other dictionaries:

  • 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 Train Control — Japanese style ATC indicator. Automatic Train Control (ATC) is a train protection system for railways, ensuring the safe and smooth operation of trains on ATC enabled lines. Its main advantages include making possible the use of cab signalling… …   Wikipedia

  • Signal passed at danger — (SPAD), in railway terminology, describes an event where a train has run beyond its allocated signal block without authority, as indicated by a lineside signal showing danger (typically a red light). It is a term primarily used within the British …   Wikipedia

  • Automatic Train Protection — (ATP) in Great Britain refers to either of two implementations of a train protection system installed in some trains in order to help prevent collisions through a driver s failure to observe a signal or speed restriction. Note that ATP can also… …   Wikipedia

  • Automatic Performance Control — (APC) was the first engine knock and boost control system that was introduced on turbo charged Saab H engines in 1982 and was fitted to all subsequent 900 Turbos through 1993 (and 1994 convertibles), as well as 9000 Turbos through 1989. The APC… …   Wikipedia

  • Automatic Warning System — Le sunflower. L’Automatic Warning System (AWS) est un système de répétition des signaux en cabine utilisé au Royaume Uni (à partir de 1956) à Hong Kong et en Australie (Queensland et …   Wikipédia en Français

  • Automatic Picture Transmission — The Automatic Picture Transmission (APT) system is an analog image transmission system developed for use on weather satellites. It was introduced in the 1960s and over four decades has provided image data to relatively low cost user stations at… …   Wikipedia

  • Signal-flow graph — A signal flow graph (SFG) is a special type of block diagram[1] and directed graph consisting of nodes and branches. Its nodes are the variables of a set of linear algebraic relations. An SFG can only represent multiplications and additions.… …   Wikipedia

  • disk signal — noun : an automatic block signal indicating train movements by the positions of colored disks …   Useful english dictionary

  • Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia