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[quote user="Datafever"][quote user="1435mm"]What's confusing you?D.E. Husman's post is accurate. [/quote]Maybe it is just me, but Ed's (first) post and Husman's post seem to be contradictory.  I notice that you were thoughtful enough to clarify that it is Husman's post that is accurate.  Thank you. [/quote]I'm copying Ed's post because I can't think through too many things at once:"You guessed right...double track means two tracks that see traffic in both directions,although some do have a "normal direction" of traffic movement depending on that railroads operating rules...two main tracks are often, but not always, run on a directional basis...main one for westward movement, main two for eastward movement.(or north and south, depends on the railroads preference and terminology)Mainline tracks under CTC and ABS have their own set of paticular rules in the GCOR."I think the first sentence is indeed unclear, in part.  Double Track is a Method of Operation (a term of art) that is "current of traffic," either right-hand or left-hand, always, unless trains are running against current of traffic (which is an unusual condition).  Two Main Tracks is a different Method of Operation where either track is regularly used in either direction.  It is true, as Ed points out, that one track tends to be mostly eastward/northward and the other mostly westward/southward, but that is more due to the limitations of crossovers (too far apart and/or too slow) and train density patterns than because the railroad "has" to operate that way.  On a well-engineered 2MT plant with a good dispatcher, you'll see lots of weaving of fast trains around slow using the crossovers.  A poor dispatcher will run it as if it was double track and make no use of the plant's flexibility.For what it's worth, most of us typically use "double track" in meetings and discussions to discuss construction of 2MT, because it rolls off the tongue faster, even though we all know it's technically and correctly 2MT.  In formal documents we try to use the correct nomenclature, and in the employee timetable, it will assuredly appear the correct way!S. Hadid
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