METHOD OF CHECKING CONDITION OF RAIL LINE Russian patent published in 2007 - IPC B61L23/16 

FIELD: railway transport; signaling and communication; interval traffic control.

SUBSTANCE: according to proposed method, track generator and receiver are connected in turn to each rail line of track block section and currents of receiving and supply ends of each rail line are recorder. Arithmetic mean of currents of supply and receiving ends are determined and compared with threshold value. Taken as threshold value is arithmetic mean of current of supply and receiving ends rail line is clear. Then state of half of rail line from side of receiving end is recorded and places of supply and receiving ends are interchanged and operation is repeated. Rail line is considered occupied if difference of arithmetic mean of currents of supply and receiving ends from threshold value exceeds 50%, and rail line is considered clear if said different is less than 25%.

EFFECT: improved reliability of checking condition of rail line at reduced insulation resistance.

2 dwg