这是3月31日拍摄的贵州瓮马铁路南北延伸线姜家坪大桥轨道铺设现场（无人机照片）。
当日，由中铁二十局承建的贵州瓮马铁路南北延伸线预制T梁和轨道铺架工程全面启动。
瓮马铁路南北延伸线北起瓮安延伸至遵义，南起马场坪延伸至都匀，全长148公里。
新华社记者 杨文斌 摄
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