 It began construction in 2015 and is scheduled to begin service in 2023.The Bellevue City Council lobbied hard for Sound Transit—a regional transit authority—to construct its light-rail line underground through Bellevue's rapidly growing downtown.Bellevue promised to devote between $104 million to $150 million toward a potential tunnel in the form of cash, services, free access to rights-of-way and one-time tax revenues that result from the East Link project.