Section 2(5)(b) in The Statutory Investigation Into Railway Accidents Rules, 1998
(b)On receipt of the proceedings of the joint inquiry (inquiry made by a Committee of Railway Officers) from the Head of the Railway Administration in accordance with rule 15 of Railway (Notices of and Inquiries into Accidents) Rules, 1997, the Commissioner of Railway Safety shall scrutinise the same, and in case he agrees with the findings of the joint inquiry, shall forward a copy of the report to the Chief Commissioner of Railway Safety alongwith his views on the findings and recommendations made. In case the Commissioner feels, he may direct the Railway Administration either to conduct inquiry de novo or re-examine specific issues and submit revised findings. On the other hand the Commissioner of Railway Safety, after examination of the joint inquiry proceedings, considers that an inquiry should be held by himself, he shall, as soon as possible, notify the Chief Commissioner of Railway Safety, the Railway Board, and the Head of the Railway Administration concerned, of his intention to hold as inquiry and he shall at the same time fix, and communicate the date, time and place for the inquiry.