In 2002, the track between Marayong and Quakers Hill was duplicated. Two further duplications were announced as part of the Rail Clearways Program—from Quakers Hill to Schofields and from Schofields to Vineyard.
In 2002, a new parallel track was constructed between Marayong and Quakers Hill. Additional duplication work was planned for the Rail Clearways Program, including sections connecting Quakers Hill to Schofields and Schofields to Vineyard.