Track Circuit

A track circuit is a simple electrical device used to detect the absence of a train on rail tracks, used to inform signallers and control relevant signals.

Read more about Track Circuit:  Principles and Operation, Transmission of Status, Siding Turnout, Track Circuit Clips, History

Other articles related to "track, track circuit, tracks":

Transmission Voie-Machine - Background - Implementation - Electronics
... TVM-430 resides in trackside boxes, which control stretches of track about 15 km (9.3 mi) long ... to the line's centralized traffic control centre, and directly controls about ten blocks of track, each with its own track circuit ... in TVM-430 and they are used alternately in pairs on both tracks of the TGV line ...
Track Circuit - Accidents - Broken Rails
... Track circuits can detect some but not all broken rails ... If there is only one relay at a turnout, part of the wiring of a turnout is bound to be in parallel, which is not protected from broken rails ...
Track Circuit Interrupter
... A track circuit interrupter may be fitted at catch points, trap points or buffer stops to maintain a track circuit in the 'occupied' state in the event of a derailment ... The track circuit remains de-energised until the interrupter is replaced ...
Track Circuit Interrupter - Application - At Catch or Trap Points
... its wheels cease to shunt the track circuit ... Since the vehicle might still be foul of the track, it is important to maintain the track circuit in the 'occupied' state ... Since the track circuit is bonded via the interrupter, it is proved to be intact when the track circuit relay is energised ...
Track Circuit Interrupter - Insulated and Non-insulated Interrupters
... Originally, track circuit interrupters were directly connected to the rail, both physically and electrically ... One of the track circuit tail cables would be connected to the interrupter, it being connected to the rail ... that the broken part, with cable still attached, could drop onto the rail and allow the track circuit to remain energised and show 'clear' ...

Famous quotes containing the words circuit and/or track:

    Within the circuit of this plodding life
    There enter moments of an azure hue,
    Untarnished fair as is the violet
    Or anemone, when the spring strews them
    By some meandering rivulet, which make
    The best philosophy untrue that aims
    But to console man for his grievances.
    I have remembered when the winter came,
    Henry David Thoreau (1817–1862)

    The universe constantly and obediently answers to our conceptions; whether we travel fast or slow, the track is laid for us. Let us spend our lives in conceiving then. The poet or the artist never yet had so fair and noble a design but some of his posterity at least could accomplish it.
    Henry David Thoreau (1817–1862)