Rail impedance directly affects the transmission performance of track circuit. Considering the condition of earth stratification. it is difficult to calculate the rail impedance due to the semi-infinite integration interval and the oscillation of the integrand by the Carson formula. Then proposing a truncation method which is applied to divide the impedance formula into definite integ... https://www.roneverhart.com/Twizzlers-Fruit-Punch-Pull-n-Peel-Licorice-Twists-19-Ounce-Bag/