AUDIO FREQUENCY TRACK CIRCUIT Russian patent published in 1998 - IPC

FIELD: railway transport. SUBSTANCE: audio frequency track circuit has signal generator connected by output through filter with transformer primary winding, secondary winding of transformer being connected with rails on one of ends of rail line section limited by insulated rail joints. Track circuit has also signal receiver connected to rails at opposite end of above-indicated rail section. Secondary winding of transformer is connected to rails at end of section adjoining feed end of section of neighboring rail line, and output of signal generator is provided with terminals designed for antiphase connection to feed end of neighboring rail line through similar filter and transformer. EFFECT: enhanced reliability of operation of electric interlocking devices using track circuits supplied from common generator. 1 dwg