What does IR mean in Railroads?

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

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What does IR mean?

iridium, Ir, atomic number 77(noun)
a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium

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"IR." Abbreviations.com. STANDS4 LLC, 2015. Web. 29 Mar. 2015. <http://www.abbreviations.com/term/53132>.