Paper tickets are quite rare these days. Most people use a digital code or a universal RFC card.
They probably only sent this by mail because it looks like they tamper-proofed this ticket with microprint.
@fred In france, we can print train ticket ourselves so this is quite common. They have a QR code that the controllers can scan.
@NekoSock what's sad is that politicians now want to replace the NFC* card with a mobile app. The NFC card just works by scanning it at each endpoint.
(*Sorry not RFC)
@fred That's probably good. Less paper is better.
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