Correct analysis of feeding circuits requires correct line constants of overhead lines and rails. Consideration of the frequency response of self-impedances and mutual impedances on steady state analysis is necessary because they affect calculation results. However, there are only a few reports on transient analysis of feeding circuits which take frequency response into account. This paper suggests a transient analysis model of overhead lines and rails with approximated frequency response, and shows the results of transient analysis on a simplified DC feeding circuit.