Section 4(2) in The Chennai Metro Railway (Carriage and Ticket) Rules, 2014
(2)No person shall take or cause to be taken on the metro railway the following offensive materials, namely :-(a)Blood dried or coagulated or decomposed, whether human or animal, except packed and covered fresh human blood for medical exigency;(b)any blood stained material or object except an accident victims with blood stained clothes;(c)corpses;(d)carcasses of dead animals;(e)bones, excluding bleached and cleaned bones;(f)fertilizer or Manure;(g)rags, including oily rags;(h)any decayed animal or vegetable matter;(i)human ashes;(j)human skeleton;(k)parts of human body; and(l)any other article declared as offensive material by the metro railway administration from time to time.
