page_title: Compressed-air vehicle
section_title: Vehicles
hierarchical_section_title: Compressed-air vehicle / Vehicles
caption_attribution_description: English: American compressed air locomotive used in boring the w:en:Rove Tunnel in France. This was Scientific American's front cover illustration 25 November 1916.
context_page_description: A compressed-air vehicle is a transport mechanism fueled by tanks of pressurized atmospheric gas and propelled by the release and expansion of the gas within a Pneumatic motor. CAV's have found application in torpedoes, locomotives used in digging tunnels, and early prototype submarines. Potential environmental advantages have generated public interest in CAV's as passenger cars, but they have not been competitive due to the low energy density of compressed air and inefficiency of the compression / expansion process.
  Compressed-air propulsion may also be incorporated in hybrid systems, such as with battery electric propulsion. This kind of system is called a hybrid-pneumatic electric propulsion. Additionally, regenerative braking can also be used in conjunction with this system.
caption: Compressed-air locomotive used in boring the Rove canal tunnel in France
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