@cn_eyee: Shanghai-Kunming High-Speed Railway (Hukun High-Speed Rail), Qinglong section, Guizhou Province This spectacular shot captures a bullet train crossing a towering viaduct deep in Guizhou’s layered mountain valleys. The line stretches across rugged karst terrain full of tunnels, steep slopes and massive bridges, a masterpiece of mountain infrastructure engineering. This stretch is widely talked about online because trains here must run far slower than the designed top speed of 300km/h. Two key reasons lead to speed limits: 1. Severe complex karst geology: The ground has countless hidden caves, underground streams and unstable rock layers. Frequent tunnel water seepage creates safety risks for high-speed trains. 2. Historical construction defects: Official investigations back in 2017 confirmed some tunnels had shoddy construction work and insufficient waterproofing during building, causing constant water leakage inside tunnels. To avoid accidents, authorities imposed strict low-speed limits on vulnerable bridge-tunnel zones. Passengers notice a huge time difference: trips that once took just 55 minutes now extend to around 90 minutes due to speed restrictions as a safety precaution. Railway teams carry out long-term repair and reinforcement works year-round to fix tunnel waterproofing and stabilize mountain geology, gradually lifting speed limits on renovated sections. While the low speed cuts travel efficiency, the breathtaking mountain viaduct scenery makes this slow ride a unique sightseeing experience for rail lovers. #HukunHighSpeedRail #ChinaHighSpeedRail #GuizhouTravel #RailwayEngineering #mountainviaduct

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Tuesday 07 July 2026 07:50:30 GMT