The 25 Hz phase sensitive track circuit has different characteristics from ZPW-2000A track circuit.However,during the retrofitting of automatic block and station coding systems,these two track circuits are often used together.The different characteristics of these two track circuits may lead to the failure of logic check at their junction.This paper analyzes the failure of normal release of the yard connection route and the loss of shunting kept in the third approach block section,and introduces the scenario and causes of these faults.It also discusses the solutions of the interlocking system,train control center system,integrated section monitoring system and relay logic check circuit for these failures,which provides reference for engineering design and fault handling in the future.
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