The following documents provide additional details about individual projects contained in the Mass Transit Expansion Plan. These projects were adopted as part of the proposal by the Sound Transit Board of Directors on July 24, 2008.
These documents were created for planning purposes and to generate cost estimates. Sound Transit will provide updated infomation to the public about each project on this list as they are further developed.
You may download the complete Mass Transit Expansion Plan and Appendices here >>>
Plan development documents related to Sound Transit 2 are available here >>>
North Corridor Projects
N06: Link LRT - Extension from University of Washington to Northgate (Seattle)
N07a: First Hill Link Connector: IDS to Capitol Hill (John St.) via First Hill (Seattle)
N22: Mukilteo Station Access (Snohomish)
N23a: New Permanent Station at Edmonds (Snohomish)
N39: Link LRT – Extension from Northgate to Lynnwood TC (Terminal) (North King/Snohomish)
East Corridor Projects
E01: Link LRT - Extension from Downtown Seattle to Bellevue CBD (East King)
E02: Link LRT - Extension from Downtown Bellevue to Overlake Transit Center (East King)
E20b: ST Express - Contribution to Bothell Parking Garage/Transit Center(East King)
E28b: LRT Preliminary Engineering/Engineering Overlake Transit Center to Downtown Redmond(East King)
E32b: Contribution to Partnership for Eastside BNSF Passenger Rail(East King)
South Corridor Projects
S27: Link LRT - Extension from SeaTac Airport to South 200th Street
S28: Link LRT - Extension from South 200th to Kent-Des Moines Road via SR 99
S29A: Link LRT - Extension from Kent/Des Moines - S 272nd via SR 99
S7b: Link LRT - Tacoma Link Extension Contribution
S131: Link LRT - Right-of-Way Preservation: South Federal Way to Tacoma Dome
S132: Link LRT - Environmental & PE: Kent-Des Moines Rd to Tacoma Dome
S24: Sounder - Lakewood–Seattle Expanded Sounder Service
S17: Sounder - Permanent Station at Tukwila
S109: Sounder - Kent Station Access
S18b: Sounder - Auburn Station Access
S20: Sounder - Sumner Station Access
S21: Sounder - Puyallup Station Access
S22: Sounder - South Tacoma Access
S23b: Sounder - Lakewood Station Access
S110: Sounder - 8-Car Platform Extensions
S25: Sounder - Track and Structure Upgrades between Tacoma Dome Station and Reservation Junction
S15b: Express Bus - Shared Funding for Parking Garage at Burien Transit Center
S16: Express Bus - Tacoma Dome Station Surface Parking Exapnsion
Systemwide Projects
SYS-LRT: Link LRT - Maintenance Bases, Vehicles and Operations for ST2 Expansion
SYS-BUS: Express Bus - ST Express Maintenance and Operations Facilities and Fleet Expansion
SYS-RAIL: Sounder - Sounder Yard and Shops Facility
SYS-PLANNING: Planning for the Future: Planning Studies
Complete Plan in pdf Format
Mass Transit Expansion proposal (.pdf, 1.5mb)
Appendix A:
Detailed Description of Facilities and Estimated Costs (.pdf, 968kb)
Appendix B:
Financial Policies (.pdf, 886kb)
Appendix C:
Benefits, Costs, Revenues, Capacity and Reliability (pdf, 1.3mb)
Appendix D:
Social, Economic and Environmental Impacts; Performance Characteristics by Mode; and Integration with Regional Land Use (pdf, 987kb)















