The tunnel design, which was composed of site cast precast and poured in place tunnel sections with sheet pile shoring, was developed in order to minimize disruption to the existing commuter rail service. Track disruption was limited to one track being out of service at a time. Additionally, each track’s service disruption was limited to only a weekend and the construction work was scheduled during that time. All tunnel work including placement of sheet piles, tunnel sections, drainage and waterproofing was accomplished during these short construction periods. A detail phasing plan was developed in order to achieve the design objectives. Coordination with Metra authorities was required throughout the construction process. The tunnel was efficiently placed with minimal disruption to the existing train service and a safe effective passageway was provided for pedestrians.