Yes, they do check tickets. On some lines they even ticket you for not sitting up straight or other infractions as they see fit if they need to make quota. A fair number of people do ride without them though.
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The Paris transport system has, like most, enforcement agents to make sure that the people taking the transportation system pay their tickets accordingly. They wear a colored armband.
If you forget to validate your ticket before you begin your journey, SNCF says that you should let the train controller know to avoid a potential fine. You have to do this immediately on boarding rather than wait to be approached. Failing to stamp your ticket can result in a fine of up to €50 - see SNCF.
These tickets must still be validated using the machines typically found inside the station or on the platforms. This validation must take place before you board the train - there's nowhere to validate a ticket on the train, and you'll incur a fine if your ticket isn't validated.
As of 2023, the city has transitioned from paper tickets to a modern, electronic system, in an attempt to make it easier for both visitors and locals to navigate the city.
In its terms and conditions, SNCF makes it clear that “the passenger in whose name the e-ticket is issued must be able to present a valid identity document with a photo: either an identity card, a passport or a carte de séjour (residence permit)”.
If you're European, your identity card is sufficient.If you're a non-European citizen, you'll need to travel with your passport. Baggage checks are carried out at all Spanish stations before boarding the train. Make sure you're ready to show your ticket when needed if there's a ticket inspector or member of staff.
The 9-Euro-Ticket (German pronunciation: [?n???n '????o 't?k?t]) was a German scheme through which passengers could travel for 9 euros (?) per month on local and regional transport in all of Germany. The tickets were valid for June, July, or August 2022.
your best bet is to take them to the venue day of event and ask the box office to verify them, but all the box is going ot do is check to see if the barcode is legit and if they have entered the building already or not.