Railways Act, 1989
117. Statement made before Commissioner.
No statement made by a person in the course of giving evidence in an inquiry before the Commissioner shall subject him to, or be used against him in, any civil or criminal proceeding, except a prosecution for giving false evidence by such statement:
Provided that the statement is-
(a) made in reply to a question which is required by the Commissioner to answer; or
(b) relevant to the subject-matter of the inquiry.