It is operated by BNSF Railway as the easternmost part of the railroad's Northern Transcon to Seattle, Washington.

[1][2][3][4] This line is colloquially known as The Racetrack because it is mostly triple-tracked and supports fairly fast trains.

Commuter service ends at the Aurora Transportation Center, though Amtrak trains continue southwest on the Mendota Subdivision.

Triple-tracking runs from where track leading to the Aurora station and Metra Yard joins the subdivision eastward to Cicero, where multiple tracks from a yard join.

[6] After the introduction of the CB&Q Zephyrs, train speeds increased significantly around the country for the next decade or so, but the Naperville train disaster along these tracks in 1946 was one event that contributed to the federal government restricting speeds in later years.