Major changes being made to Sound Transit Express bus service routes that stop at the Mountlake Terrace Transit Center is an effort by the agency to provide more trips between Seattle and Everett, Sound Transit officials said. Modifications include an expansion of Route 512 to seven-day-a-week operations and added weekday trips on Route 513; changes go into effect on Sunday, Sept. 29.
Sound Transit routes 511 makes regular stops at the Mountlake Terrace Transit Center on both its southbound and northbound trips between downtown Seattle and the Ash Way Park & Ride in south Everett; routes 512 and 513 likewise stops at the transit center on their runs between downtown Seattle and the Everett Station at 3201 Smith Avenue in Everett.
Route 512’s seven-day-a-week service will continue to operate peak hours/peak direction (southbound in the morning, northbound in the afternoon) in addition to early morning, midday and late evening trips; Route 512 will the only Sound Transit Express bus route between Everett and Seattle operating on weekends.
Route 513 will be getting four additional southbound trips between Everett and Seattle during peak morning hours and five additional northbound trips during peak afternoon hours.
You can find additional information about Sound Transit Express bus changes here.