The Chicago and North Western Railway's Peninsula 400 was a daily passenger express train running from Chicago to Ishpeming. It was one of the railroad's 400 passenger trains, whose name stemmed from the original '400-mile, 400-minute' express operated by the railroad between Chicago and Minneapolis–St. Paul.

Service began in 1942, and ended on 15 July 1969. The Peninsula 400 is still the last regular passenger train to have serviced the Upper Peninsula.

Stations served in Marquette County include Little Lake and Ishpeming.

Wikipedia: Peninsula 400

Timetable: Collection of David Wilson