Seattle and Snohomish County. 500s (Sound Transit Express) Routes in this series are Sound Transit Express routes with the exception of Pierce Transit routes 500 and 501 serving Federal Way. This list shows the routes Metro operates under contract to Sound Transit, it does not include routes operated by Community Transit or Pierce Transit (who operates some routes solely within King County). 600s (Community Shuttle and Trailhead Direct) This series of numbers is used for routes considered temporary or experimental. Currently community shuttle routes use these numbers. These routes are operated using Metro owned minibuses, operated by drivers from the non-profit Hopelink and partially funded by the communities they serve. While all routes operate on a fixed route, they also offer a flexible service area where passengers can be picked up and dropped off, if they make a reservation in advance. The 600s are also used for the Trailhead Direct shuttle system, which runs on weekends and holidays during the spring and summer. 700s (West Seattle Water Taxi shuttle) These routes are shuttles connecting neighborhoods West Seattle to the Seacrest Park King County Water Taxi terminal for service to Pier 50 on downtown Seattle's waterfront. They serve all posted bus stops along the route. Although both are classified as DART (Dial-a-Ride Transit) routes, only route 773 has a zone where during weekday mid-day trips buses may deviate from their route. During the winter months (late October to early April) mid-day and weekend service is suspended on the West Seattle Water Taxi and on the shuttle routes. Routes in the 700s are also used for special event services, such as Washington Huskies football games at Husky Stadium. 800s (Custom & Community Transit Commuter - UW ) Both Community Transit and King County Metro operate routes in the 800s, but the numbers used by the two agencies do not overlap. King County Metro assigns custom bus routes serving schools in Bellevue, Kirkland and on Mercer Island route numbers in the 800s. Metro provides one peak trip each school day. For commuter routes connecting the University of Washington and Snohomish County, operated by Community Transit, see List of Community Transit Bus Routes. 900s (DART & Custom) Dial-A-Ride-Transit services are assigned route numbers 900-939. Custom bus routes are assigned route numbers from 950-999. The King County Water Taxi uses route numbers 973 and 975. Currently routes serving the private Lakeside School and University Prep