AUTOMATIC INTERLOCK WITH VOICE FREQUENCY TRACK CIRCUITS WITHOUT INSULATED RAIL JOINTS Russian patent published in 2000 - IPC

FIELD: railway transport. SUBSTANCE: proposed device relates to railway signalling and interlocking systems, particularly to devices for interval control of train movement on blocking sections. Proposed device considered on example of blocking section with organized first and second track circuits has intermediate light signals 1 and 2 installed at border of blocking section, track circuit generator 3 connected to middle of blocking section, receivers of track circuits 4, 5, 6 and 7 with corresponding track relays 8, 9, 10, and 11 connected to ends of first and second rail circuits of each blocking section 12, 13, 14 and 15 at a distance of 40 m after signal lights 1 and 2, block relay 16 into main supply circuit of which front contact 10.1 of track relay 10 is placed, and into block circuit of which parallel- connected resting contact 9.1 of track relay 9 and series-connected front contacts 8.1 of track relay 8 and 16.1 of block relay 16 are placed, and yellow light signal relay 17 into supply circuit of which parallel- connected change-over contact 16.2 of block relay 16 and front contact 9.2 of track relay 9 are placed. EFFECT: prevention of possibility of keeping clear green or yellow light when short-length train stops at signal light, increased safety of traffic. 1 dwg