This Chicago & North Western line, now owned by Union Pacific, originally ran from the Ganville area of Milwaukee through the eastside of the city to downtown on Lake Michigan. However for decades the line has ended near Estabrook Park at Hampton Avenue. The line is about 2 miles long, has bridges over I-43, Estabrook Park, Lincoln Park, and bridge over Milwaukee River. The line runs from a connection north of Green Bay Avenue to Hampton Avenue.
Thanks to Chandler Benn for contributing information about this route.