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Reference.org
Track circuit
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<p>A track circuit is an electrical device used to prove the absence of a <a href="/facts/Train/0mkFQDg9">train</a> on a <a href="/facts/Signalling_block_system/kmEQ9k0K">block</a> of <a href="/facts/Railway_track/erncmXfX">rail tracks</a> to control <a href="/facts/Railway_signal/NkCzHKtd">railway signals</a>. An alternative to track circuits are <a href="/facts/Axle_counter/lH2zK4N5">axle counters</a>. </p>