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From: Webster's Revised Unabridged Dictionary (1913)

 Traf·fic mile. Railroad Accounting Any unit of the total obtained by adding the passenger miles and ton miles in a railroad's transportation for a given period; -- a term and practice of restricted or erroneous usage.
    Traffic mile is a term designed to furnish an excuse for the  erroneous practice of adding together two things (ton miles and passenger miles) which, being of different kinds, cannot properly be added.    --Hadley.
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