Skanska Civil Northeast/Koch JV has secured a $1.06-billion design-build contract from the Massachusetts Bay Transportation Authority to replace the aging Draw One rail bridges at Boston's North Station, one of the Northeast's most operationally constrained commuter rail corridors. “Replacing the Draw One Bridge is one of the most important rail infrastructure projects in Massachusetts history,” Gov. Maura Healey said in a March announcement advancing the project. The project will require crews to maintain continuous Amtrak and MBTA service through years of phased construction. The MBTA selected the joint venture following a multi-phase procurement; VHB, a Watertown, Mass.-based engineering and design firm, is serving as design partner on the contract. "The replacement of the Draw One bridges is one of the most significant infrastructure investments in the MBTA Commuter Rail system," said Ricky Carey, design manager at VHB.…