Two key officials of the Railway Board -- Principal Executive Director of Signalling Sandeep Mathur and Member of Operation and Business Development Jaya Varma Sinha -- on Sunday explained how the Odisha train accident might have occurred.

The officials also gave a virtual clean chit to Coromandel Express driver, whose locomotive was involved in the three collision in Odisha's Balasore district that left over 288 people dead and hundreds injured. The railways said the Coromandel Express was "not over-speeding" and received the green signal to enter a loop line on which a goods train was stationary, PTI reported.