A "rainbow lashup" leads the Belt Railway of Chicago's Clearing Yard to Pine Bluff, Ark., manifest south on the Chester Sub on January 24, 2015.

The DPU of a southbound loaded oil train for Saint James, La., CREX (Citirail) 1346, pushes hard as it rolls down the Chester Sub south of Grand Tower in the late afternoon of January 24, 2015.

At Kingsferry Road, a frac sand unit train for Monahans, Texas rolls down the Chester Sub in the late afternoon of September 19, 2014.

Southbound at Milepost 92 south of Howardton Jct.