Pubcaster NHK, Japan’s five commercial webs and Tobu Railway will build the world’s tallest tower for transmitting terrestrial digital broadcasts.At slightly over 2,001 feet, the edifice will top the current world record holder, Toronto’s 1,814-foot CN Tower, and overshadow the 1,092-foot Tokyo Tower, a landmark and tourist draw since its completion in 1958. Tower will be built in a disused freight shunting yard owned by Tobu. Construction will start in 2008 and will be completed by 2011, when the switch to digital broadcasting is skedded to be complete in Japan. Cost is expected to reach ¥50 billion ($427 million), with the coin coming mainly from the webs and local government. Tobu will launch a company to supervise the construction and manage the tower.