Track Circuits

Some articles on track circuits, track, track circuit:

Railway Signalling - Train Detection - Axle Counters
... axle counters can provide similar functionality to track circuits, they also exhibit a few other characteristics ... environment an axle counted section can be far longer than a track circuited one ... The low ballast resistance of very long track circuits reduces their sensitivity ...
Principles and Operation - Jointless Track Circuits - Some Popular AF Track Circuits Used in The UK
... Some of the earliest audio frequency track circuits still in use today were made by the Aster company in France ... Frequencies of the Aster SF 15 type track circuit are 1700 Hz and 2300 Hz on one track and 2000 Hz and 2600 Hz on the other ... To address these problems, modulated track circuits were developed like the TI21 system ...
Sperry Rail Service - Track Circuits
... Track circuits detect some broken rails, but not all. ...
Signal Passed At Danger - Collision Avoidance - Track Circuits
... Track circuits detect the presence of trains and can, for example, hold signals at stop in the first place to prevent accidents ... such as train stops rely on detection systems such as track circuits ...

Famous quotes containing the words circuits and/or track:

    The Buddha, the Godhead, resides quite as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain or in the petals of a flower.
    Robert M. Pirsig (b. 1928)

    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)