美国芝加哥铁路由于新轨供应量少,不值得建立焊轨厂和组织运送长钢轨的列车,而线路接头病害严重及其他种种原因,又使发展无缝线路在所必行,因此采取在线路上焊接旧轨的方法发展无缝线路。1974年末,该铁路用荷兰德公司的闪光对焊移动式焊机焊了2,000个接头,先焊了半哩1973年铺设的新轨,接着焊接1955年铺设的115 The United States Chicago Railroad due to the lack of new track supply, not worth the establishment of welding track factory and organization of long rail transport train, and the serious road junction disease and other various reasons, but also make the development of seamless lines in the necessary, so to take on the line Ways to weld the old track to develop seamless lines. In late 1974, the railway welded 2,000 joints with Dutch-German flash-butt welder, welds half a mile of new rails laid in 1973 and then welded 115