THE RAILWAYS ACT, 1989 – Chapter XV – Section 141

141. Needlessly Interfering with Means of Communication in a Train
If any passenger or any other person, without reasonable and sufficient cause, makes use of, or interferes with, any means provided by a railway administration in a train for communication between passengers and the railway servant in charge of the train, he shall be punishable with imprisonment for a term which may extend to one year, or with fine which may extend to one 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, where a passenger, without reasonable and sufficient cause, makes use of the alarm chain provided by a railway administration, such punishment shall not be less than:-

(a) A fine of five hundred rupees, in the case of conviction for the first offence; and
(b) Imprisonment for three months in case of conviction for the second or subsequent offence.

Forward reference⇒ Section 142