<p>South Shore Line train service will remain partially suspended until Friday following a freight train derailment and power loss Wednesday night near East Chicago and Gary, Ind., officials said. </p><p>Partial service was restored to the Monon Corridor Thursday afternoon, though delays were still expected, officials said. In place of Monon shuttle train service, four Extra Monon Corridor trains were being run.</p><p>Both corridors will reopen Friday using a holiday schedule, including busing between Miller and Hegewisch stations, according to a Thursday afternoon service alert.