The incident came to light last night when a female passenger at the Kanpur railway station tried to visit the train's toilet but found it locked from the inside. She also knocked on the toilet door continuously but when no one answered she informed the Railway police, a GRP spokesperson said.
The GRP personnel then found the body hung by a piece of cloth inside the toilet, he said.
As per an identity card found on the body, the deceased has been identified as one Shyam Lal, hailing from East Champaran in Bihar, he added.