Union Pacific SD40-2 3939, Ex-Missouri Pacific 6039, renumbered in April 1987.
UP 3939 & 7529 lead the westbound salad shooter.
A quartet of six axle power speeds through Castle Rock on the Joint Line.
A long mixed freight lays on the horn as it runs through several crossings in rural Sullivan, Illinois.
The Southbound ZBRLC works downgrade through Ravenna in Soledad Canyon.
