Miningunder the village , the railway and the water is a problem in mining, which is related to the safety and the economic benefit in every coal pit.
“三下”采煤的安全问题是长期以来在采矿中值得注意的问题，它关系到矿井作业的安全和经济效益问题。
2
The fully mechanized caving coal miningunder the railway in mine area will result in difficult maintenance of railway because of great deformation and subsidence speed of terrene and railway.
在矿区铁路下进行放顶煤开采所引起的地表及铁路的变形量大，变形速度快，从而导致矿区铁路维护困难。
3
Meanwhile constructing Tangxu Railway, Kaiping Mining Bureau, under the guiding of Kinder, secretly manufactured the first set of locomotive of China.