Original sentence: ) Although currently the trains are only in 4-car configuration, most platforms have provision for 8-car trains for when patronage increases.Construction began on 12 February 2001 and the line opened on 21 December 2004, six days earlier than the proposed opening date
Edited sentence: ) Although currently the trains are only in 4-car configuration, most platforms have provision for 8-car trains when patronage increases.Construction began on 12 February 2001 and the line opened on 21 December 2004, 3 days earlier than the proposed opening date.KCRC estimated the construction cost of Ma On Shan Rail would be HK$10 billion