GM2's Complex Bridge staff participated in the design of this Design/Build project, which replaced the 120-year old rail viaduct bridge on the busy Media-Elwyn Regional Line. The new steel girder bridge has five spans and is 735-feet long.

The Design/Build Team provided innovative approaches to designing and delivering the new bridge under budget and on time despite its fastpaced schedule, which only permitted a nine-week rail shut down to allow completion of existing bridge demolition, superstructure and deck erection, rail work and catenary system installation. The work was performed on a 24 hour a day, 7 day a week schedule during the nine-week shutdown.

The lateral slide Accelerated Bridge Construction technique was used. The new girders and precast deck (entire superstructure) were assembled to one side of the existing bridge, on the newly constructed
straddle bents, which were built under and through the existing bridge. During the shutdown, the complete superstructure was slid into place once the existing bridge was removed. Ballast, ties and rail completed the construction.

The aggressive project schedule required daily coordination between the owner, contractor and designer to ensure permitting, design and site access remained on schedule.