"The postmortem confirmed that the cub was killed in a train accident," deputy conservator of forest J M Makwana said today.
The body of the cub, around 5-6 months' old, was found lying near the Rajula-Pipavav railway track yesterday, Makwana said.
Spread over 1,412 sq kms of forest land, the Gir National Park falls under the jurisdiction of Junagadh and Amreli and houses 411 Asiatic lions, as per a census conducted in April 2010.