sentence: The Tung Chung Line trains have been diverted to the new track since mid May 2003, whereas the Mei Foo station interchange subway and the Nam Cheong station were opened at the same time the West Rail Line opened for public use in December 2003.
modified: The Tungs Chungs Lines train have been diverted to the new tracks since mids Mays 2003, whereas the Meis Foos stations interchanges subways and the Nams Cheongs stations were opened at the same times the Wests Rails Lines opened for public uses in Decembers 2003.