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The Loram Railvac is an excavation machine designed to convey material through vacuum and airflow. The machine is rail mounted and designed to travel at track speeds while towing ballast cars. The combination of a powerful digging arm with twin engines and vacuum pumps makes it capable of excavating compacted ballast, clay, mud, water, sand, and soil, the company says. The digging arm can work at distances up to 15 feet from track center line. Loram says the Railvac is ideal for cribbing and undercutting mainline mud spots, removing fouled ballast and debris from tunnels, cleaning and installing drain tiles and culverts, removing ballast from bridge decks and grade crossings without removing ties or rail, and undercutting switches and diamonds.