History of Cramer Tunnel The Cramer Tunnel is the longest railroad tunnel in the state of Minnesota, measuring 1,800 feet from the entrance to exit.  During the peak of the taconite industry in the 1950s, LTV Steel used a 72-mile railroad system to connect their Hoyt Lakes taconite plant with their Taconite Harbor shipping port located near Schroeder, MN.  The most visible part of this system for most North Shore visitors is the three railroad overpasses that allowed trains to cross over Highway 61 to areas around Taconite Harbor.  You will pass under these as you drive on Highway [...]