Kishor Kale, 20, left the train Monday with the bag in Kurla, a Mumbai suburb, the newspaper MiD Day, reported Tuesday. He opened the bag at the station, hoping to find cash or valuables, and instead a tiny hand poked out.
Kale tried to dump the bag and baby on the platform but was caught by an alert ticket seller. He told police he was hawking nail polish on the train when he spotted the bag on the floor.
Police said the baby is only about 15 days old. While he is in good health, he would probably have suffocated if he had remained in the bag 10 minutes longer.
Jitendra Rathod, a senior officer with the Government Railway Police in Wadala, said investigators are examining security camera footage to verify Kurla's story of how he came by the bag and to find out who dumped it and the baby.
"It's good that the hawker found the bag. Had the child been inside for 10 more minutes, he would've died," another officer said.