1. When the SS Edmund Fitzgerald was built in 1958, it was the biggest Great Lakes freighter ever built, a record thought unlikely to be broken. Why?
From Quiz The Tragedy of the SS Edmund Fitzgerald
Answer:
Maximum size to fit through the St Lawrence Seaway
The Northwestern Mutual Life Insurance Company of Milwaukee, Wisconsin, were heavily invested in iron and minerals industries but not shipbuilding. Nevertheless, in 1957, they commissioned the building of the "SS Edmund Fitzgerald" with a brief describing the desired length to be "within a foot of the maximum length allowed for passage through the soon-to-be completed Saint Lawrence Seaway" which was 730 feet. The ship had a deadweight of 13632 tons with a 729-foot hull making it the longest vessel on the Great Lakes and it earned the title "Queen of the Lakes" when launched in 1958. (On September 17, 1959, when the SS Murray Bay was launched, it was a foot longer at 730 feet. However, the Queen of the Seas moniker was not transferred to the marginally longer, newer ship).
The ship carried raw materials from the railhead of Duluth, Minnesota, and adjacent Superior, Wisconsin, to the industrial cities on the Lakes further east such as Detroit, Toledo, Cleveland and Gary, Indiana. Loading took four hours, unloading 14. The ship was fast, capable of 14 knots or 16mph. The ship created many speed records and by November 1975 it had made 748 round trips on the Great Lakes.