Sound Transit’s Federal Way Link Extension: Rail Project Details

Sound Transit’s Federal Way Link light-rail extension opens Dec 6, adding 7.8 miles to the system.

Sound Transit’s Federal Way Link Extension: Rail Project Details
September 7, 2025 11:36 am

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Introduction

Sound Transit will launch service on the Link 1 Line light-rail extension to Federal Way, Washington, on December 6. The project, which has been under construction since 2020, extends the light-rail system by 7.8 miles.

Project Overview

The Federal Way extension is currently undergoing pre-revenue testing. It adds 7.8 miles to the Link light-rail system. The route primarily utilizes elevated track between Angle Lake and downtown Federal Way, according to Sound Transit’s expansion webpage.

New Stations

The new route incorporates three new stations located at Kent Des Moines, Star Lake, and downtown Federal Way. The extension will connect Federal Way to the remainder of the Link system, including stops at the Seattle-Tacoma International Airport and Seattle.

Project Timeline

Planning and construction of the Federal Way Link extension project have spanned over eight years. Construction commenced in 2020.

Financial Details

The estimated cost of the extension is $2.5 billion, which includes a $629 million federal loan and $948 million in grants, as reported by The Seattle Times.

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Conclusion

The Link 1 Line light-rail extension to Federal Way, Washington, will commence service on December 6. The 7.8-mile extension, which began construction in 2020, includes three new stations and has a total cost of $2.5 billion.

Company Summary

Sound Transit: A Seattle-area transit agency.

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