For a series of articles on CMCK, see their press release page
http://www.cmkcgroup.com/eng/sub04/sub_0402.php?req_P=bl&req_BIDX=2&req_BNM=5f0038e170564c7ad98d949c741a4da2
Followme, approx 5 years of construction for complete upgrade - I guess it depends which parts of the track they work on first. I expect they will use existing rail until improved transport is available.