Commuters who were forced to stand in a first class carriage because their train was so full were fined because they did not have the right ticket.
Passengers were told to pay £20 in penalties even though there was no room for them in standard class on the packed morning service from Surrey to London.
The incident is the latest in a string of controversies involving train operator Southern Railway, which has been accused of running late and crowded services on popular commuter routes.
Passenger Pete Boyland was one of the passengers on the 7.36am service from Oxted to London Bridge who had to stand in first class because there was no space in any standard class carriage.
In a letter to his local MP, he said that customers including an elderly woman were forced to stand up for the entire 35-minute journey, but the ticket inspector showed no sympathy.
The employee dished out fines of £20 or twice the ticket price to all the passengers in first class whose tickets he could reach.
'The train was so packed in fact that the "revenue officers" were unable to pass through to me to check my ticket, despite my clear proximity to them,' Mr Boyland said.
'This is a fine example of the attitude of Southern, who only seem concerned about protecting their revenue, and less about providing an acceptable level of service.'
He called for East Surrey MP Sam Gyimah to crack down on the company following a series of high-profile problems with its rail services.
A spokesman for Southern Railway said that it was up to individual ticket inspectors to decide whether or not to fine customers for standing in first class on packed trains.
He added: 'First class accommodation does not get automatically de-classified if the train is busy, but conductors do have discretion and may de-classify first class if deemed necessary.'
The company, which operates services from Surrey and Sussex into London Bridge and Victoria stations, has been under fire in recent months over persistent delays and overcrowding.
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