sound transit operates three transit services across the seattle metropolitan area: the link light rail system in seattle and tacoma; the sounder commuter rail system from everett to lakewood, via seattle; and the sound transit express bus system across the three counties. in 2017, these systems carried more than 47 million passengers, averaging 156,000 riders on weekdays. all three modes accept cash payment and mobile tickets as well as the regional orca card, a contactless proximity card with stored fares and passes.