The railway employee alleged that when he greeted Holger Erik Misch by saying "welcome to India", the German hit him.
Police are now probing the incident which comes days after a Swiss couple were attacked near the railway station at Agra's Fatehpur Sikri.
Misch and railway supervisor Aman Kumar entered into an altercation and fought with each other yesterday at around 1 pm at platform number one of the Robertsganj railway station, a senior police official said in Lucknow.
Police officials said that it had also emerged that an FIR was lodged against the German national on July 5 in Kullu, Himachal Pradesh, for attacking a person with a sharp edged weapon.
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His passport and visa is deposited in the chief judicial magistrate court, they said.
Misch refused to talk to the media.
Earlier, on October 22, two tourists from Switzerland, Quentin Jeremy Clerc (24) and Marie Droz (24), were chased and attacked with stones and sticks by a group of five youths in Fatehpur Sikri, triggering widespread outrage.
External Affairs Minister Sushma Swaraj had sought a report from the UP government on the attack. Union Minister of State for Tourism K J Alphons had dashed off a letter to Chief Minister Yogi Adityanath, saying the incident could have a negative impact on the image of the country.
Even as the police probed German national Misch's allegations, the opposition Samajwadi Party (SP) attacked the BJP government over what it called the "growing attacks" on foreign tourists in the state.
"Earlier in Agra and now in Sonbhadara. The situation is the same everywhere. It's a big achievement on the tourism front that the pride and lives of foreign tourists are in danger. This is Yogi (Adityanath) government," SP spokesman Sunil Singh Sajan said.
BJP spokesman Shalabh Mani Tripathi said that the incident was unnecessarily "hyped" by the opposition.