当你沉睡时，他们在火花中守护每一趟列车

12:37 AM. Changsha South Station falls silent. As the last train parks and passengers drift to sleep, a crew in bright uniforms takes the stage. Cutting machines roar, grinding wheels spark, welding fireworks bloom in the darkness — bright as daylight. 210 minutes: tear out, replace, weld, restore. By dawn, everything is back to normal and no traveler ever notices. While you sleep, someone is keeping you safe.

凌晨0:37，长沙南站归于寂静。当最后一班高铁停靠、旅客进入梦乡，一群身穿亮色工装的人悄然登场。切割机高速运转，砂轮摩擦钢轨，焊花在深夜倏然绽放——如白昼般耀眼。210分钟，拆轨、换轨、焊接、修复，一气呵成。天亮之前，一切恢复如初，旅客浑然不觉。你看不到的深夜，有人在替你守护平安。