With reference to the readiness to commence with Metrorail services from 1 July 2020 as he confirmed (a) which rail lines and/or sections will be prioritised and ready for use, (b) what are the reasons for excluding other rail sections from being prioritised and ready for use and (c) what cost is associated with bringing the excluded rail sections into full service including the (i) distances in kilometres for each excluded section and (ii) number of commuters using each excluded rail section?