Brittanie Zakutney: The expression "pairs of rails" is not used. You do not call a railroad line a rail. A rail is the strip of metal that the wheels on one side of the train ride on. If there are three railroads between A and B and four between C and D, that is what you would say. If for some reason you wanted to add them without saying how they were divided you would say "there are a total of seven railroads between A and B and between C and D."
Billie Bratchett: In Britain I would say "Seven railway tracks". Americans would say "Seven railroad tracks". Possibly "lines" could be used instead of "tracks".
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