沙田至中環綫
A new underground interchange concourse with natural light was built to the east of the current concourse, taking up one level, allowing passengers to transfer to the new lines. The atrium was also expanded. The station expansion, located under Harcourt Garden, incorporated 34 escalators and five lifts to integrate with the existing station. The Sha Tin to Central Link will be one level under the interchange concourse, with the South Island line being directly below it. Exits E1 and E2 are being rebuilt as one exit to accommodate the glass roof of the interchange concourse. This new exit E will not open until the Sha Tin to Central Link platforms open. While the Sha Tin to Central Link tracks will have sidings for terminating trains south of the station, the South Island line tracks end at bumper blocks north of the station with no overrun track.