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本文介绍了复线施工同时进行既有线改造时，应该处理的三个问题：复线施工同时进行既有改造与运输二者的关系；复线施工和既有线改造的行车安全；既有线改造通车后提高限速问题。
This article introduces three problems that should be dealt with in the process of double-track construction while reconstructing the existing ones: the construction of double-track construction at the same time carries out the relationship between the existing reconstruction and transportation; the traffic safety of double-track construction and existing lane reconstruction; Speed problem.