Precast concrete sections are fitted into place after being deposited in position by a special handling vehicle at the AEC… https://www.rawpixel.com/image/3322288/free-photo-image-cave-black-and-white-lights-shadowsFree Image from public domain licenseRailway tunnels. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286049/free-photo-image-awesome-cc0-creative-commonsFree Image from public domain licenseColorful light exposure in a tunnel https://www.rawpixel.com/image/576901/light-tunnel-backgroundView licenseTrain rail tunnel. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285735/free-photo-image-background-tunnel-architectureFree Image from public domain licenseGolden light in tunnel. 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