The oldest predecessor of the line was the Chicago and Indiana Air Line Railway, chartered on December 2, 1901. Service began in September, 1903, between East Chicago, Indiana and Indiana Harbor (now a neighborhood of East Chicago, but once an independent municipality). The following year it was renamed the Chicago, Lake Shore and South Bend Railway. Revenue service began July 1, 1908, on the line from Michigan City east to South Bend. An extension west to State Line Junction in Hammond, a transfer point for other railroads, opened September 8.
Chicago Lake Shore and South Bend Railroad
The Chicago Lake Shore and South Bend Railroad (CLS&SB) began serving northern Indiana in 1908. It was part of the Interurban growth that was beginning across the United States.