Railways Act, 1989
166. Defacing public notices.
If any person without lawful authority-
(a) pulls down or willfully damage any board or document set up or posted by the order of a railway administration on a railway or any rolling stock; or
(b) obliterates or alters any letters or figures upon any such board or document or upon any rolling stock, he shall be punishable with imprisonment for a term which may extend to one month, or with fine which may extend to five hundred rupees, or with both.