1. the whole quantity of track owned by a railroad.
  2. the right of one railroad company to use the tracks of another.
  3. the money paid for this right.

Origin of trackage

An Americanism dating back to 1875–80; track + -age Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for trackage

Historical Examples of trackage