This short video features the use of 'roll-out/roll-in' accelerated construction techniques to complete two bridge replacements with minimal disruption to Amtrak’s high-speed rail services – with an added benefit to the community.

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As a critical link along Amtrak’s Northeast Corridor, Stonington harbour lays claim to two century-old single span bridges on a causeway that were in need of replacement.

Amtrak faced a unique challenge with these bridges because they needed to be replaced with minimal disruption to rail traffic while also being sensitive to the needs of the community.

The client's long-term partner, consultant Modjeski &Masters determined that the most cost effective and efficient way to replace both bridges was to use an accelerated construction technique.

This required the new M&M-designed through-girder superstructures to be constructed on temporary rail platforms parallel to the existing bridges.

Once substructure modifications were completed, the superstructures of the old bridges were 'rolled-out' and the new ones were 'rolled-in' successfully with minimal rail traffic outage. M&M’s superstructure design brought an added benefit to the community – the shallow depth of the replacement structure provided a slight increase in vertical clearance. This allowed a new class of boats to pass underneath the bridges, thereby driving new business to local docks and growing the local economy.