 They said they had plans to replace 16 miles/26 km of transit lines with a new system designed to eliminate some of the problems that contributed to corrosion, such as caribou crossings that cause dips in the line.They also announced plans to change the environment in the pipes with continuous corrosion inhibitor added directly to the transit lines and with water or sediment buildup addressed with weekly maintenance pig runs; a new leak detection system; and new pig launchers and receivers in all segments of the transit lines, giving BP the capability to regularly run maintenance and smart pigs in all segments of the transit lines.Two segments of the transit system were scheduled to be replaced in 2007 and two in the winter of 2008, with a goal to have the entire module work completed by the end of 2008.