After travelling on the Metro to Denfert-Rochereau, my wife and I walked onto the platform for the RER to Charles De Gaulle Airport. My wife looked for a ticket machine or office on the platform and there did not appear to be any. Please note this was on a Sunday. A train arrived and we boarded. During the journey I stopped the Guard as he was passing and asked to purchase tickets. He charged us 50 Euros. We had paid just over 16 Euros for the same journey on the inward leg. I am aware that I was charged a Penalty Fare, but it appeared that we did not have the opportunity to buy tickets before this point. I explained this to the Guard, who seemed to be suggesting that we should have left the train at some point during the journey and purchased tickets off-train. As a railway employee in the UK I am not totally naieve, but I find it hard to believe we were expected to get off mid-journey and purchase tickets to avoid a penalty.
Can someone with experience let me know if we simply didn't look hard enough at Denfert-Rochereau, or were we harshly treated ?
