Sound Transit Will Replace Rail With Buses
Maintenance work in the Mercer Island tunnel will force service changes in October 2026.
Updated on Oct. 2, 2026 in Car Maintenance
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Sound Transit will utilize bus bridges to replace light rail service during overhead power system repairs scheduled for October 2026. These maintenance efforts aim to enhance overall system resiliency and reliability for Seattle commuters.
Why it matters
Regular maintenance on critical infrastructure like the Mercer Island tunnel is necessary to ensure long-term system performance. These planned service adjustments help crews safely execute repairs on the overhead power grid.
Crews will conduct maintenance during a nightly window from 11 p.m. to 4 a.m. to minimize disruption to transit users.
The players
Sound Transit
Sound Transit is the public transit agency that operates light rail, commuter rail, and bus services in the Seattle metropolitan area.
The details
Maintenance crews are scheduled to perform essential repairs on the overhead power system within the Mercer Island tunnel. During these times, bus bridges will be deployed to provide alternative transportation for riders affected by the temporary light rail service suspension.
Timeline
October 6-8, 2026: Overnight bus replacements occur for the 1 and 2 lines.
October 17-18, 2026: All-day bus replacements occur for the 2 Line.
Roadmap
This maintenance project aligns with ongoing regional efforts to preserve and modernize transit infrastructure across the Seattle area. It reflects a broader industry shift toward prioritizing the longevity of existing electric rail networks through proactive structural care.
Commuters should plan for additional travel time when using transit services on the affected October dates. Travelers using the 1-Line and 2-Line should monitor real-time updates to determine how bus bridges will affect their specific arrival times.
The takeaway
Proactive maintenance is vital for maintaining high standards of safety and operational uptime in public transit systems. Riders can minimize travel delays by checking transit schedules in advance whenever infrastructure work is announced.
Further reading
For more information on upcoming transit changes, visit the Car Maintenance section.
Source note: This article includes information reported by KOMO.
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