A fire broke out in an AC coach of the Delhi-bound Thiruvananthapuram-Hazrat Nizamuddin Rajdhani Express in Madhya Pradesh's Ratlam district early on Sunday, prompting evacuation of 68 passengers.All the passengers were deboarded from the train. None of the passengers sustained injuries. (Representative)According to railway officials quoted by news agency PTI, no casualties have been reported in the blaze that broke out at 5.15 am in the B-1 coach of the train (12431) carrying 68 passengers, prompting emergency measures.Ratlam division PRO Mukesh Kumar said that the incident occurred between Alot and Lunirichha stations under the Kota division of the railways. The affected coach was detached from the rake, and overhead electric supply (OHE) was promptly switched off to ensure safety."All the passengers were deboarded from the train. None of the passengers sustained injuries. Arrangements have been made to accommodate them in other coaches for the journey up to Kota. An additional coach will be attached at Kota station to restore full capacity, Kota Railway PRO, Ravindera Lakhara, told PTI.The Divisional Railway Manager (DRM) of Ratlam has reached the spot, and the accident relief train has also arrived there, Kumar said. According to the officials, the cause of the fire is under investigation.