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.
A duplicate track was constructed between Marayong and Quakers Hill in 2002, with further duplication planned for the Rail Clearways Program, including sections from Quakers Hill to Schofields and from Schofields to Vineyard.