TY JOUR TI A METHOD FOR OBTAINING THE A-PARAMETERS OF A RAIL LINE EQUIVALENT FOUR-POLE WITHOUT ANALYTICAL SOLUTIONS OF DIFFERENTIAL EQUATIONS FOR THE CASE OF A BROKEN RAIL KW track circuit KW mathematical model of rail line KW simulation modeling KW broken rail mode KW rail break JO Transport automation research AU Scherbina, A.E. AU Scherbina, E.G. PY 2024 IS 10 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"