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 liable for the first contravention with penalty of two thousand rupees, for any second or subsequent offence, he shall be punishable with imprisonment for a term which may extend to one month, or with fine of five thousand rupees, or with both:]
[Provided that in the absence of special and adequate reasons to the contrary to be mentioned in the judgment of the court, such punishment shall not be less than a fine of two thousand rupees:
Provided further that if the person refuses to pay the penalty, he shall be produced before the competent court and shall be punishable with a fine which may extend up to five thousand rupees.]