This project involves the replacement of 22 bridges on the UP North Line in Chicago, Illinois. The structural scope of work will include, but not be limited to, replacement of existing stone abutments, retaining wall construction, steel spans, and decks. Also, some track work will be accomplished between the bridges, including the replacement of wood ties with concrete ties, and some commuter station modifications will be required, including the Ravenswood Station. To ensure reliable train operations, the
project will include various signal improvements, including: new interlockers at Addison Street (MP 5.0) and Rosehill (MP 7.3, between Balmoral Avenue and Bryn Mawr Avenue), and upgrades to the Deering interlocker (MP 3.2). In