LSI meaning in Regional ?

Answer:

What is Lake Superior and Ishpeming Railroad mean?

The Lake Superior and Ishpeming Railroad (reporting mark LSI), a U.S. railroad offering service from Marquette, Michigan, to nearby locations in Michigan's Upper Peninsula, began operations in 1896. The LS&I continues to operate as an independent railroad from its headquarters in Marquette.

At the end of 1970, LS&I operated 117 miles of road on 241 miles of track (188 on 388 km); that year it reported 43 million ton-miles (63 million tkm) of freight. In 2011, LS&I had been reduced to 25 miles (40 km) of track.

reference

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