To pass through train or transit barriers with an e-ticket in 2026, you simply need to locate the illuminated glass scanner on the top or side of the barrier and present the QR code on your smartphone. Most modern barriers are designed for "contactless" interaction; you should hold your phone screen about 2-3 inches away from the glass, facing down or toward the sensor. Ensure your screen brightness is turned up to the maximum, as low light can make the code difficult for the machine to read. If you are using a mobile wallet (like Apple or Google Wallet), the code will often pop up automatically as you approach the gate via NFC or location triggers. If the barrier has a green arrow and the "tick" sound plays, the gates will open. If it fails, avoid "tailgating" (following someone else through) and instead look for the staffed manual gate or a "wide gate," where an attendant can manually verify your ticket using a handheld scanner.