Sound Transit is expected to take over full ownership of the tunnel in 2021. During the transition to train-only operations in early 2020, Sound Transit built connections to East Link at International District/Chinatown station. Over a ten-week period that began in January 2020, four-car trains ran on a single track within the tunnel, with through-passengers transferring at Pioneer Square station via a temporary center platform, reducing frequency to 13–15 minutes. The tunnel was also closed for four weekends until work was completed in late March, after a week-long delay in testing. Frequency restrictions brought on by the project remained due to the coronavirus pandemic and local shutdowns.