铁路既有线改造,是一种投资少、工期短、迅速提高运输能力、见效快的措施。集中力量搞好既有线改造,对解决运输急需,提高投资效益和促进四化建设有重大作用。本文对既有线改造的技术政策、标准和措施提出若干建议。 The reconstruction of the existing railway line is a measure of quick investment, short construction period, rapid improvement of transport capacity and quick response. Concentrating on improving existing lines will play an important role in solving the urgent need of transportation, improving investment returns and promoting the four modernizations. This article puts forward some suggestions on technical policies, standards and measures for the reconstruction of existing lines.