About 6:51 p.m., c.s.t., on January 21, 1985 eastbound Chicago, South Shore and South Bend Railroad (South Shore) train No. 123 and westbound South Shore train No. 218 collided head-on on the eastward main track about 1,490 feet west of the west end of the Gary Station platform at Gary, Indiana. The eastward main track was being used for single-track operation for about 3.5 miles between the end of the double track east of Gary Station and Clark Crossover west of Gary Station because damage caused by cold weather breaks to the catenary propulsion power system over the westward main track made the track unusable by electrically propelled trains. The lead cars of the self-propelled units of each train were crushed and derailed. Seventy-nine passengers, 6 crew members, and 2 off-duty employees were injured in the collision. The South Shore estimated the damage to be about $2,433,000.