Metra does not refer to its lines by particular colors, but the timetable accents for the Union Pacific West line are "Kate Shelley Rose" pink, honoring an Iowa woman who saved a Chicago & North Western Railway train from disaster in 1881.

It diverged from the main line at West Chicago and had stations at Elgin, Marengo, Belvidere, Rockford, Freeport, and other communities.

The line runs from the Ogilvie Transportation Center in downtown Chicago through the western suburbs to Elburn.

As of February 16, 2024, Metra operates 58 trains (29 in each direction) on the Union Pacific West Line on weekdays.

The improvements are designed to ensure smoother traffic flow and reduce conflicts between commuter and freight trains.