The victim, identified as Surekha Saxena (56), is the principal of a Kendriya Vidyalaya in Gwalior city. Her brother, Surender Saxena, was accompanying her in the AC II tier compartment of Samata Express, in which the incident took place yesterday, said DCP (Railways) Dumbere Milind Mahadeo.
In her complaint, Saxena told the police that she and her brother had taken lunch, followed by tea, around 3 PM once the train reached Mathura railway station.
Saxena and her brother, both turned drowsy possibly because of the unidentified chemical spray and soon went into a semi-conscious state. Other passengers in the compartment were reported to be too confused to react, said a police official.
After around half-hour, Saxena realised that the vendor had allegedly robbed her of her wallet and also taken away her brother's gold-plated watch.
Saxena and her brother also had to be rushed to Moolchand Hospital, where they were undergoing treatment.
"We have reported the matter to the GRP at Mathura and transferred the Zero FIR to the police station concerned. Police are now looking for the vendor who allegedly committed the robbery," the official added.