24. Different kinds of conveyance by rail.

(a) ordinary second class carriages ;
(b) second class carriages with iron gated windows and iron railings between the compartments, and
(c) prison vans:
(b) Prisoners of exceptionally dangerous character, who require extra vigilance for their safe custody shall be conveyed in custody by jail in prison vans only. If prison van is not available alternative mode of transportation may be sent by the Commissioner of Police