12月28日，乘务员在从贵阳北开往昆明南的G4135次列车上整理行李。当日，上海至昆明高速铁路贵阳至昆明段开通运营，标志着我国又一条东西向的高铁干线沪昆高铁全线贯通。沪昆高铁东起上海，西至昆明，途经上海、浙江、江西、湖南、贵州、云南等省市，线路全长2252公里，列车运行时速300公里，是中国东西向线路里程最长、速度等级最高、经过省份最多的高速铁路，多项技术指标达到世界领先。沪昆高铁全线贯通后，从上海坐火车前往昆明只要11个小时，比现有的沪昆铁路节省23个小时。[新华社 欧东衢 摄]
An attendant works on the G4135 train on the Shanghai-Kunming high-speed railway, Dec. 28, 2016. China on Wednesday put into operation one of the world's longest high-speed railways, linking the country's prosperous eastern coast to the less-developed southwest. The Shanghai-Kunming line -- 2,252 km in length -- traverses the five provinces of Zhejiang, Jiangxi, Hunan, Guizhou and Yunnan and cuts travel time from Shanghai to Kunming from 34 to 11 hours, according to China Railway Corporation. (Xinhua/Ou Dongqu)