This document summarizes a simulation of transient skin effect in DC railway systems using MATLAB/Simulink. It discusses: 1) The need to model skin effect in the time domain rather than frequency domain to distinguish starting and fault currents. 2) Using a step series algorithm to calculate remote short circuit current for skin effect calculation. 3) The design of a circular cylinder model, application of step voltage signals, and calculation of frequency dependent current response. 4) A complete Simulink model and S-function model flowchart for remote short circuit simulation.