Red Line Maintenance Work
The Red Line has more than 44 miles of track: It runs 11.5 miles from Alewife to Ashmont and 17.5 miles from Alewife to Braintree (and back!). The tracks are just a piece of the complex system that supports trains weighing hundreds of thousands of pounds—and 227,000 rider trips each weekday.
We’re working hard to keep the tracks in good repair and support new Red Line vehicles coming into service with:
- Track replacement and station improvements through 2019
- Floating slab maintenance in 2020
Building a Better T 2020
This project is one of many we are accelerating in 2020 that will deliver results to riders sooner.
Floating Slab Maintenance
Work on the floating slab system between Harvard and Alewife stations resumed on weekends in January 2020. Shuttles replace Red Line service while work is completed.
Floating slabs are concrete slabs that “float” between the tracks and rubber disks that absorb sound and vibration from trains. To continue to provide comfort and reliability on the Red Line, the slabs must be regularly maintained or replaced.
Work on floating slabs includes demolishing the old slabs, placing new rebar, and pouring new concrete. The concrete takes more time to set than is available overnight between regular service hours, so we need to shut down service on weekends.
We also do this work in sections, because the tight working space in the tunnel limits the amount of work we can get done and the equipment we can use to do it. The nearest access point for equipment is the tunnel entrance near Kendall Square—if we did all this work at once, we would need to shut down a larger portion of the Red Line for an extended period of time.
Track Replacement and Station Improvements
From November 15 – December 15, 2019, shuttles replaced train service between Kendall/MIT and Broadway on 4 weekends to support Red Line work through the T’s Capital Acceleration Plan.
These closures allowed us to complete station improvements and track replacements at Park Street 4 months earlier than planned, and at Downtown Crossing 11 months earlier than planned. We closed a broader section of the track so crews could bring vehicles and equipment into the central subway tunnel.
We thank you for your patience during these closures.