With reference to his reply to question 1635 on 12 June 2018, what (a) amount was paid out by the Passenger Rail Agency of South Africa (Prasa) to victims of train crashes since 1 June 2018, (b) number of persons were (i) killed and (ii) injured in Prasa-related crashes in the specified time period and (c)(i) has he found to be the main causes of accidental deaths and injuries on the Prasa network, (ii) steps has his department taken to rectify the situation and (iii) are the deadlines, milestones, time frames and time lines in this regard?