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Red Line Floating Slab Maintenance

Updated on March 19, 2019

red line at alewife

About the Project

Timeline: Ongoing
Status: Construction


The floating slab system between Harvard and Alewife stations will be repaired and replaced on weekends in early 2019. Shuttles will replace Red Line service while work is completed.

What are floating slabs?

Floating slabs are concrete slabs that “float” between the tracks and rubber disks that absorb sound and vibration from the trains. They must be regularly maintained, and this work takes longer than the time available to do it overnight. 


Customers will be more comfortable and service will be more reliable, because the new concrete and rubber disks will absorb train noise and vibrations.

Service Alerts

Red Line

Bus shuttles will replace train service between Harvard and Alewife during weekends between February 9 – April 28, 2019.

See all Red Line alerts