Red Line Floating Slab Project
The Red Line track from Harvard to Alewife sits on concrete slabs floating on rubber disks that absorb noise and vibration from trains. Years of water infiltration into the tunnel has resulted in corrosion and cracking that must be addressed in order to maintain safe and reliable Red Line service.
During the weekends of November 17-18, 2012, November 24-25, 2012, December 1-2, 2012, and December 1-2, 2012, MBTA work crews will be removing and replacing corroded concrete slabs as part of a project partially funded by the American Recovery and Reinvestment Act. In addition to correcting problems with the floating slab structure, the project will involve the replacement of track and third rail. Workers will also address leaks in the tunnel to prevent further deterioration.
Weekend Bus Replacement
Due to the complexity of this project, work cannot be completed during the short overnight period when service is not operating. Materials can only be brought to the job site by rail, and the nearest access point is more than two miles away near the Longfellow Bridge. Also, the concrete requires a certain period of time to settle before train service can begin.
As a result, buses will replace Red Line trains between Harvard Square and Alewife Stations during four consecutive weekends in November and December as an extension of the previous Floating Slab-related weekend Red Line diversions that took place from November 2011 into March 2012.
For shuttle updates and information, please check Red Line service advisories here.
|Floating Slab Presentation - 10.16.2012||Word|