(a) whether the shortage of coaches is likely to jeopardize the safety of passengers in Railways;
(b) if so, the details thereof;
(c) whether the old coaches are subjected to periodic overhaul and also put through a mid-life rehabilitation;
(d) if so, the details thereof along with the procedure for replacement age of the bogies used in the Railways; and
(e) whether the Railways have any proposal to increase the speed of existing long route trains in the country and if so, the details thereof?