The Union Pacific / Northwest Line (UP-NW) is a commuter rail line provided by Metra and operated by the Union Pacific Railroad in Chicago, Illinois and its surrounding suburbs. While Metra does not refer to any of its lines by colors, the timetable accents for the Union Pacific/Northwest line are bright "Viking Yellow," honoring the Chicago & North Western Railway's Viking passenger train.[3] The line runs from Ogilvie Transportation Center to Harvard, Illinois. However, most trains terminate in Crystal Lake, Illinois. A branch line to McHenry, Illinois operates during weekday rush hours in the peak direction. Overall, this is Metra's longest route and one of three routes with branches (the others being the Rock Island District and Metra Electric District). The line is Metra's second busiest with an average of 38,600 boardings on a weekday. It is second only to the BNSF Railway Line. The line is triple-tracked from Clybourn to just southeast of Barrington, with a bidirectional express track, and double tracked from Barrington to Harvard. The McHenry branch is single-tracked. Historically, double track was maintained from Harvard to Baraboo, Wisconsin. A now-gone portion of the Union Pacific / Northwest Line diverged at Harvard and passed through Beloit, Wisconsin, and reconnected to the main line at Evansville junction to allow a separate passenger and freight line. Around the time the Beloit line was abandoned, the railroad single-tracked the line from Harvard to Janesville.
We already have 2 of the locos needed for Metra in the game: the F40PH-3 and MP36PH-3C. This route just needs the locos in Metra liveries (including Heritage liveries). The bi-level passenger cars are needed for commuter services. The Nippon Sharyo cars are included in the Peninsula Corridor route, so those would be easy for DTG to add to this route. For UP, I'd suggest a GP60/GP62 or GP40N/GP40-2 for local switching services and either a C45ACCTE, C45AH, or SD70M for heavy freight trains.
