Metra Electric District

The Metra Electric District (MED or ME) is an electrified commuter rail line owned and operated by Metra which connects Millennium Station (formerly Randolph Street Station), in downtown Chicago, with the city's southern suburbs. As of 2018, it is the fifth busiest of Metra's 11 lines, after the BNSF, UP-NW, UP-N, and UP-W Lines with nearly 7.7 million annual riders. While Metra does not explicitly refer to any of its lines by color, the timetable accents for the Metra Electric District are printed in bright "Panama orange" to reflect the line's origins with the Illinois Central Railroad (IC) and its Panama Limited passenger train. Apart from the spots where its tracks run parallel to other main lines, it is the only Metra line running entirely on dedicated passenger tracks, with no freight trains operating anywhere on the route (the only exceptions perhaps being occasional work or repair trains). The line is the only one in the Metra system with more than one station in Downtown Chicago, the only line with no stations in fare zone 4, and also has the highest number of stations (49) of any Metra line.

It is the only Metra line powered by overhead lines, the only line with high-level platforms and level boarding, and the only line with three service branches. Trains operate on 1,500 V DC. The main line north of Kensington/​115th Street is shared with the Northern Indiana Commuter Transportation District's South Shore Line, an electric interurban line through northern Indiana to South Bend. Per a longstanding non-compete agreement, South Shore trains stopping at stations shared with the Electric District only pick up passengers heading eastbound (outbound from Chicago) and only discharge passengers heading westbound (inbound to the city).