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BIDIRECTIONAL AUTOMATIC LINE BLOCKING SYSTEM IN PARTICULAR FOR LONG STATION-TO-STATION DISTANCESKIROVKI,A OSOBENNO DLJA MEZHSTANCIONNOGO RASSTOJANIJA BOLSHOJJ PROTJAZHENNOSTI
BIDIRECTIONAL AUTOMATIC LINE BLOCKING SYSTEM IN PARTICULAR FOR LONG STATION-TO-STATION DISTANCESKIROVKI,A OSOBENNO DLJA MEZHSTANCIONNOGO RASSTOJANIJA BOLSHOJJ PROTJAZHENNOSTI