A massive fire broke out in one of the air-conditioned coaches of a Delhi-bound Rajdhani Express in Madhya Pradesh's Ratlam this morning, with officials saying that no one was injured in the incident. The fire broke out around 5:15 am in the B-1 coach carrying 68 passengers. The incident occurred between Vikramgarh Alot and Luni Richha stations, officials said. The affected coach was detached from the rake, and the overhead electric supply (OHE) was promptly switched off to ensure safety. The cause of the fire is under investigation, the railways said.