Magistral line

(Fort.) the guiding line, or outline, by which the form of the work is determined. It is usually the crest line of the parapet in fieldworks, or the top line of the escarp in permanent fortifications.

See also: Magistral

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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It's a once-in-a-lifetime chance in June to travel on the Baikal-Amur Magistral line - a huge feat of Soviet engineering in the 70s, 80s and 90s that cuts through the spectacular Sayan Mountains, extremely remote Severobaikalsk and into the permafrost at Novy Urgal.