What does SM mean in Railroads?

This page is about the meanings of the acronym/abbreviation/shorthand SM in the Regional field in general and in the Railroads terminology in particular.

St. Marys Railroad Company

Regional » Railroads

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Definition

What does SM mean?

samarium, Sm, atomic number 62(noun)
a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite

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"SM." Abbreviations.com. STANDS4 LLC, 2015. Web. 3 Aug. 2015. <http://www.abbreviations.com/term/54369>.