(1) How many executives of the Passenger Rail Agency of SA (Prasa) and its predecessors were dismissed since 2006; (2) whether a settlement amount was paid to any of them; if not, why not; if so, how much was paid in each case; (3) whether he will give reasons for these payments since these people were dismissed; if not, why not; if so, what are the relevant details; (4) whether the board of Prasa or its predecessors approved such payments; if not, who approved these payments?