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[quote user="nbrodar"]I've never seen the term DT (Double Track) or 2MT (2 Main Track) in my timetables.  My current (NORAC) TTs list the the tracks as Rule 251 (signaled in one direction) or Rule 261 (signaled in both directions), with track numbers, ie 1 Main, 2 Main.So, after 8 years as a professional railroad, I was unaware of the difference between DT and 2MT.Nick[/quote]2MT and double-track are the terms used in GCOR.  GCOR railroads formerly used Rules 251 and 261 for the same thing, as NORAC does still.  The original question asked the difference between 2MT and double-track, it did not ask the difference between Rule 251 and Rule 261, so none of us that answered saw any need to add that.After my 25 years in the railroad business, I still use "251 territory" in everyday conversation, and many of the people I work with do so also.S. Hadid
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