(1)With reference to the signalling systems, rolling-stock and related infrastructure at each train station, (a) how often was each system (i) tested and (ii) maintained (aa) in the (aaa) 2014-15, (bbb) 2015-16 and (cc) 2016-17 financial years and (bb) since 1 April 2017;
(2) (a) what were the results of each test respectively and (b) what action was taken in each case?