With reference to the Prasa signalling systems and maintenance work thereof, (a) what are the details of the work that is still outstanding in the 2017-18 financial year in each province, (b) why have these maintenance projects not been completed, (c) what is being done to resume and complete the maintanance work in each area respectively, (d) what are the timelines and deadlines for each area in this regard, (e) what are the amounts already paid in respect of each project and (f) (i) what are the total outstanding amounts in respect of each project and (ii) when will the outstanding amounts be paid in each case?