Pneumo Lines are a variant of the Pneumo Tube mailing system used by Jet-Postal all around Rapture, and were first introduced in BioShock Infinite's downloadable content, Burial at Sea - Episode 1. As opposed to the main system designed to move only mail and small packages through the city, they provide transportation for heavier packages, using Pneumo Bots (television-looking devices with robotic arms and a speaker) running on lines parallel to some of the pneumatic tubes, entering and exiting places through small iris-shaped doors. They can be seen all over Fontaine's Department Store as part of the home delivery service offered to the clients.