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Boston's Red - Blue Connector will cost $850 million and take a decade to complete
A presentation to MBTA (The Massachusetts Bay Transportation Authority) board estimates that, connecting the Red and Blue Lines of Boston via a 2000-foot tunnel (so-called `Red-BlueConnector) will cost $850 million and take a decade to complete.
Presentation slides at MBTA website:
https://cdn.mbta.com/sites/default/files/2021-06/2021-06-07-fmcb-O-red-blue-connector-update.pdf
cover tunnel photo by: Matt Brown from London, England / CC BY
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Presentation slides at MBTA website (it is a PDF file):
https://cdn.mbta.com/sites/default/files/2021-06/2021-06-07-fmcb-O-red-blue-connector-update.pdf