# Sound Transit Express

Sound Transit Express (ST Express) is a network of regional express buses, operated by the multi-county transit agency, Sound Transit. The routes connect major regional hubs throughout 53 cities in three counties (King, Pierce, and Snohomish) in the Puget Sound region. Sound Transit Express ranks first in the nation in the number of commuter bus passengers carried and in vehicle miles driven. The first nine routes and 114 buses began carrying passengers on September 19, 1999. In 2023, the system had a ridership of 8,565,100, or about 31,100 per weekday as of the third quarter of 2024.
Unlike a typical transit bus, Sound Transit Express routes typically make limited stops as they travel longer distances on the freeways. Most routes operate seven days a week, with runs throughout the day. Where available, buses use transit-only lanes, high-occupancy vehicle lanes, high-occupancy toll lanes, express lanes, bus bypass shoulders, and direct access ramps to speed travel times.
While Sound Transit oversees, plans, and funds the service, operation and maintenance of the buses is contracted out to Community Transit (who subcontracts with Transdev), King County Metro and Pierce Transit.

## Fares

ST Express uses a flat fare system, where each ride costs the same regardless of distance.
The fares are as follows:
| Fare type | All |
| Adult | $3.25 |
| Senior (65+) / Disabled / Medicare (Regional Reduced Fare Permit required) | $1.00 |
| Low-income (ORCA LIFT card required) | $1.00 |
| Youth (6–18 years) | Free |
| Children (0–5 years, with fare paying passenger) | Free |
Paper transfers are not accepted or issued on Sound Transit routes. Passengers who use ORCA may transfer between ST routes or routes operated by most other agencies within two hours of initial payment. If the fare for the second route is higher, the difference will be charged.

## Routes

23 Sound Transit Express bus routes are overseen by the agency. Buses are operated under contract by King County Metro, Pierce Transit and Community Transit (who subcontracts with Transdev). When Sound Transit implements a new bus route, changes are frequently made to existing routes that serve the area to avoid overlapping.
The ST Express routes and operators as of September 14, 2024 are:
| Route | Off-peak service | Weekend service | Start | Via | End | Operator |
| 510 | No (use route 512) | No (use route 512) | Downtown Seattle | I-5, South Everett Freeway Station, Mountlake Terrace Freeway Station | Everett Station Downtown Everett (select trips only) | Community Transit |
| 512 | Yes | Yes | Lynnwood City Center Station | Ash Way Park & Ride, South Everett Freeway Station | Everett Station Downtown Everett (select trips only) | Community Transit |
| 513 | No | No | Lynnwood City Center Station | Ash Way Park & Ride, Eastmont Park & Ride | Seaway Transit Center | Community Transit |
| 515 | No | No | Lynnwood City Center Station | I-5, Mountlake Terrace Freeway Station | Downtown Seattle | Community Transit |
| 522 | Yes | Yes | Roosevelt Station | Lake City Way, Bothell Way NE, Ballinger Way, Kenmore Park & Ride | University of Washington, Bothell/Cascadia College Woodinville Park & Ride (select trips only) | King County Metro |
| 532 | No (use routes 535 & 512) | No | Downtown Bellevue | Bellevue Transit Center, Totem Lake Freeway Station, Brickyard Freeway Station (reverse peak only), I-405 & NE 195th (reverse peak only), Canyon Park Park & Ride , Ash Way Park & Ride, South Everett Freeway Station | Everett Station | Community Transit |
| 535 | Yes | Saturday only | Downtown Bellevue | Bellevue Transit Center, Totem Lake Freeway Station, Brickyard Freeway Station, Bothell Park & Ride, University of Washington, Bothell/Cascadia College, Canyon Park Park & Ride, Alderwood Mall | Lynnwood Transit Center | Community Transit |
| 542 | Yes | Yes | U District Station | University of Washington, University of Washington Station, Evergreen Point Freeway Station, Yarrow Point Freeway Station, Overlake Transit Center, SR 520 & NE 51st Freeway Station, Downtown Redmond | Redmond Transit Center | King County Metro |
| 545 | Yes | Yes | Downtown Seattle | Capitol Hill (select trips), Montlake Freeway Station (closed since 2019), Evergreen Point Freeway Station, Yarrow Point Freeway Station, Overlake Transit Center, SR 520 & NE 51st Freeway Station, Downtown Redmond, Redmond Transit Center | Bear Creek Park & Ride | King County Metro |
| 550 | Yes | Yes | Downtown Seattle | Mercer Island Park & Ride, South Bellevue Park & Ride, Bellevue, Bellevue Transit Center | Bellevue (Library) | King County Metro |
| 554 | Yes | Yes | Downtown Seattle | Mercer Island Park & Ride, Eastgate Freeway Station, Issaquah Transit Center, Issaquah Highlands Park & Ride | Issaquah Highlands Park & Ride Redmond (185th Avenue NE & Redmond/Fall City Road, select weekday trips only) | King County Metro |
| 556 | No | No | U District Station | University District (Seattle), University of Washington, University of Washington Station, Evergreen Point Freeway Station, Yarrow Point Freeway Station, Bellevue Transit Center, South Bellevue Park & Ride, Eastgate Freeway Station, Issaquah Transit Center | Issaquah Highlands Park & Ride | King County Metro |
| 560 | Yes | Yes | Bellevue Transit Center | Newport Hills Park & Ride, Kennydale Freeway Station, Renton, Renton Transit Center, Sea-Tac Airport, SeaTac/Airport Station, Burien Transit Center | Westwood Village | Pierce Transit |
| 566 | Yes | No | Remond Technology Station (select trips) State Route 520 & NE 40th St (select trips) | Bellevue Transit Center, Newport Hills Park & Ride (off peak only), Kennydale Freeway Station (off peak only), Renton, Renton Transit Center, Kent Station (select trips), Auburn Park & Ride (select trips) | Kent Station (select trips) Auburn Transit Center | King County Metro |
| 574 | Yes | Yes | Sea-Tac Airport | SeaTac/Airport Station, Kent/Des Moines Freeway Station, Star Lake Freeway Station, Federal Way Transit Center, Tacoma Dome Station, SR 512 Park & Ride | Lakewood Transit Center | Pierce Transit |
| 577 | Yes | Yes | Downtown Seattle | I-5 | Federal Way Transit Center | Pierce Transit |
| 578 | Yes | Yes | Downtown Seattle | Federal Way Transit Center, Auburn Station, Sumner Station | Puyallup Station | Pierce Transit |
| 586 | No | No | University District (Seattle) | University of Washington Medical Center, SR 520, I-5, Federal Way Transit Center | Tacoma Dome Station | Pierce Transit |
| 590 | No (use route 594) | No (use route 594) | Downtown Seattle | SODO Busway, Tacoma Dome Station | Tacoma Dome Station Downtown Tacoma (one early morning trip only) | Pierce Transit |
| 592 | No | No | Downtown Seattle | SR 512 Park & Ride, Lakewood Station | DuPont Station | Pierce Transit |
| 594 | Yes | Yes | Downtown Seattle | SODO Busway, Tacoma Dome Station, University of Washington Tacoma, Downtown Tacoma, SR 512 Park & Ride | Lakewood Station DuPont Station (select trips only) | Pierce Transit |
| 595 | No | No | Downtown Seattle | SODO Busway, Tacoma Community College Transit Center, Narrows Park & Ride, Kimball Drive Park & Ride | Gig Harbor (Purdy Park & Ride) | Pierce Transit |
| 596 | No | No | Sumner Station | SR 410 | Bonney Lake Park & Ride | Pierce Transit |

## Fleet

Sound Transit owns a fleet of 360 buses operated by three different local transit agencies. Sound Transit buses are painted white with aqua, turquoise, and blue waves along the sides, representing the Puget Sound region ST Express serves, and most feature a freely-adapted representation of the Sound Transit bus and train system map on the seating fabric.
Occasionally, vehicles that are not in Sound Transit livery are used on Sound Transit routes by the operating agencies. Also, Sound Transit vehicles may also be used by the local agencies for other commuter routes. This is due to vehicles having mechanical problems, vehicle allocation issues, and assignment errors.
| Manufacturer and model | Motor | Length | Passengers | Purchased | Qty | Fleet Numbers | Operator |
| Gillig Phantom | Cummins ISL / Allison B400R | 40' | 42 (seated) | 2007 | 22 | 9092–9113 | Pierce Transit |
| New Flyer DE60LF | Cummins ISL / GM-Allison E$^P$50 | 60' | 56 (seated) | 2007–2008 | 2 | 9622–9623 | King County Metro |
| New Flyer DE60LF | Cummins ISL / GM-Allison E$^P$50 | 60' | 56 (seated) | 2009 | 13 | 9624–9636 | King County Metro |
| Gillig Low Floor BRT Hybrid | Cummins ISL / Allison H 40 EP | 40' | 35 (seated) | 2008 | 22 | 6901–6930 | Pierce Transit |
| Motor Coach Industries D4500CL | Detroit Diesel Series 60 EGR | 45' | 57 (seated) | 2008 | 7 | 9713–9719 | Pierce Transit |
| Motor Coach Industries D4500CL | Detroit Diesel Series 60 EGR | 45' | 57 (seated) | 2009 | 3 | 9720–9722 | Pierce Transit |
| Motor Coach Industries D4500CL | Detroit Diesel Series 60 EGR | 45' | 57 (seated) | 2010 | 17 | 9723–9739 | Pierce Transit |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2010 | 13 | 9553–9565 | Community Transit |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2011 | 1 | 9566 | Community Transit |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2011 | 17 | 9567–9583 | King County Metro |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2011 | 3 | 9584–9586 | King County Metro |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2011 | 10 | 9587–9596 | King County Metro |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2012 | 14 | 9800–9813 | King County Metro |
| New Flyer D60LFR | Cummins ISL9 | 60' | 56 (seated) | 2012 | 5 | 9818–9822 | King County Metro |
| New Flyer DE60LFR | Cummins ISL9 / Allison H 50 EP | 60' | 56 (seated) | 2010 | 11 | 9637–9647 | King County Metro |
| New Flyer DE60LFR | Cummins ISL9 / Allison H 50 EP | 60' | 56 (seated) | 2011 | 4 | 9648–9651 | King County Metro |
| Gillig Low Floor BRT Hybrid | Cummins ISL9 / Allison H 40 EP | 40' | 35 (seated) | 2012 | 22 | 9201–9222 | Pierce Transit |
| Gillig Low Floor BRT | Cummins ISL9 | 40' | 35 (seated) | 2012 | 2 | 9122–9123 | Pierce Transit |
| Gillig Low Floor BRT | Cummins ISL9 | 40' | 35 (seated) | 2015 | 3 | 9124–9126 | Pierce Transit |
| New Flyer Xcelsior XDE60 | Cummins ISL9 / Allison H 50 EP | 60' | 57 (seated) | 2014 | 8 | 9652–9659 | King County Metro |
| New Flyer Xcelsior XDE60 | Cummins ISL9 / Allison H 50 EP | 60' | 57 (seated) | 2014 | 7 | 61401–61407 | Pierce Transit |
| New Flyer Xcelsior XDE60 | Cummins L9 / BAE Systems HybriDrive Series-E | 60' | 52 (Seated) | 2020 | 31 | 9660–9690 | King County Metro |
| New Flyer Xcelsior XD60 | Cummins ISL9 | 60' | 57 (seated) | 2014 | 4 | 9814–9817 | King County Metro |
| New Flyer Xcelsior XD60 | Cummins ISL9 | 60' | 57 (seated) | 2014 | 3 | 51401–51403 | Pierce Transit |
| Alexander Dennis Enviro500 MMC | Cummins ISL9 | 42' | 82 (seated) | 2015 | 5 | 91501–91505 | Community Transit |
| Alexander Dennis Enviro500 MMC | Cummins ISL9 | 42' | 82 (seated) | 2017 | 32 | 91701–91732 | Community Transit |
| Alexander Dennis Enviro500 MMC | Cummins L9 | 42' | 82 (seated) | 2020 | 13 | 91901–91913 | Community Transit |
| Gillig Low Floor BRTPlus CNG | Cummins Westport ISL G | 40' | 35 (seated) | 2015 | 17 | 41501–41517 | Pierce Transit |
| Gillig Low Floor BRTPlus CNG | Cummins Westport ISL G | 40' | 35 (seated) | 2016 | 5 | 41601–41605 | Pierce Transit |
| Motor Coach Industries D4500CT CNG | Cummins Westport ISX12 G | 45' | 57 (seated) | 2016 | 12 | 9301–9312 | Pierce Transit |

## Retired fleet

| Manufacturer and model | Motor | Length | Passengers | Purchased | Retired | Qty | Fleet Numbers | Operator | Notes |
| OBI Orion V CNG (05.501) | Cummins L10G / ZF HP500 | 40' | 42 | 1994 | 2008 | 27 | 801–827 | Pierce Transit | Ex-Pierce Transit; bought in 1998. Retired in 2008. |
| Breda DuoBus 350 (ADPB 350) Dual-mode | Detroit Diesel 6V92TA / ZF 4HP590C | 60' | 63 | 1990 | 2005 | 20 | 5019–5021, 5194–5210 | King County Metro | Leased from King County Metro Transit in 1999. Retired in 2005. Replaced by DE60LFs. |
| Gillig Phantom 40' | Cummins ISM / Allison B400R | 40' | 42 | 1999 | 2014 | 70 | 9000–9069 | King County Metro / Pierce Transit / Community Transit | All retired from Sound Transit Fleet. As of June 2014, some of the coaches sold to Pierce Transit are temporarily wrapped in ST for PT operated routes due to a bus shortage. Ben Franklin Transit purchased a handful. Transit Sales International purchased some as well. |
| Gillig Phantom 40' | Cummins ISM / Allison B400R | 40' | 42 | 2001 | 2014 | 20 | 9070–9089 | King County Metro | Retired in 2014. |
| Gillig Phantom 40' | Cummins ISL / Voith D864.5 | 40' | 42 | 2005 | 2020 | 2 | 9090–9091 | King County Metro | Retired in 2020. Replaced by XDE60s. |
| Gillig Phantom 40' | Cummins ISL | 40' | 42 | 2008 | 2020 | 8 | 9114–9121 | Community Transit | Retired in 2020. Replaced by ADL Enviro500 MMC. |
| New Flyer DE40LF | Cummins ISB / Allison E$^P$40 | 40' | 34 | 2003 | 2020 | 1 | 9200 | King County Metro | Retired in 2020. Replaced by XDE60s. |
| New Flyer C40LF | Cummins Westport C Gas Plus / Allison B400R | 40' | 39 | 2001 | 2014 | 20 | 9400–9419 | Pierce Transit | Retired in 2014. Replaced by Gillig CNG Low Floor BRT. |
| New Flyer D60LF | Detroit Diesel Series 50 / Allison B500R | 60' | 56 | 1999 | 2016 | 25 | 9500–9524 | Pierce Transit / King County Metro / Community Transit | Retired in 2016. Some units were bought by Transit Sales International. |
| New Flyer D60LF | Detroit Diesel Series 50 EGR / Allison B500R | 60' | 56 | 2000 | 2019 | 12 | 9525–9536 | Community Transit / King County Metro | Retired in 2019. Some units were bought by Transit Sales International. |
| New Flyer D60LF | Caterpillar C9 / Allison B500R | 60' | 56 | 2004 | 2020 | 16 | 9537–9552 | Community Transit / King County Metro / Pierce Transit | Retired in 2020. |
| New Flyer DE60LF | Caterpillar C9 / Allison E$^P$50 Hybrid System | 60' | 56 | 2005 | 2020 | 22 | 9600–9621 | King County Metro | Retired on Thursday, August 27, 2020; 9609K - final active unit. Replaced by XDE60s. |
| Motor Coach Industries D4500 | Detroit Diesel Series 60 | 45' | 57 (seated) | 2005 | 2022 | 13 | 9700–9712 | Pierce Transit | Retired on July 29, 2022; 9712P - final active unit service was on rt. 578 to Puyallup via Federal Way and I-5. |