The toddler slipped through the gap between the platform and the moving train after her mother tripped while getting off at Mambalam railway station here, a senior Government Railway Police (GRP) official said.
The woman sustained serious injuries in her legs, he added.
"Lakshmi tripped as the train started moving while she was getting off the Mannai Express from Mannargudi," the official told PTI, adding that the woman has been hospitalised.
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