Section 166. Defacing public notices

166. Defacing public notices .—If any person without lawful authority— (a) pulls down or wilfully damages 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.