A fine of Rs five lakh has also been imposed on the catering firm, a statement issued by Western Railway said.
According to a Railway Protection Force (RPF) official, Pradip Gupta (48) and his wife were travelling by the 12910 Hazrat Nizamuddin-Bandra Garib Rath Express. At 10.10 PM last Sunday, after the train left Kota Junction, Gupta asked for a bottle of water.
Taking offence, the pantry car man called his colleagues and they allegedly thrashed Gupta. His wife also suffered injuries when she tried intervene.
"It was really horrible being beaten up by people who were supposed to serve us. No passenger came to our rescue," Gupta told PTI.
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After the incident, the accused pulled the alarm chain and got down between Kota and Ratlam stations, he said.
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Taking strong exception to the incident, railways today issued show cause notice to the catering company concerned asking why its contract should not be cancelled.
The services of the Catering Manager and the waiter involved in the incident were also suspended, said a senior Railway Ministry official.
Safety and security of passengers are utmost important for railways and this kind of behaviour by the catering staff is not accepted, said the official.