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| Study and Application of Reverse Procedure for Railway Engineering Survey |
| ZHANG Jian，LIU Xin—wen |
| The Fouah Engineering Company，China Railway First Group Co．，Ltd．，Xianyang，Shanxi 712000，China |
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Abstract Research purposes: The common method for railway engineering survey is to calculate corresponding angle and distance from home mirror spot to back—sight point according to the known mileage and external distance，but in the real survey and recheck，it is difficult to calculate the corresponding mileage and external distance to the track，while knowing the angle and distance．So it is necessary to do the research on the reverse procedure for railway engineering survey to easily calculate the corresponding mileage and external distance．
Research conclusions: Through researching the reverse procedure for engineering survey，the reverse procedure for railway engineering survey is worked out with the fx一4800P(4859P)calculator．The introduction is given to the applicable method of the reverse procedure and its applications in the measurement and lofting of the border pile and completion measurement．The calculation example shows this reverse procedure is reliable with perfect applicable value．
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Received: 30 March 2009
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[1]安鸿逵．铁路曲线测量用表[M]．北京：中国铁道出版 社，1995．
[2] 安鸿逵．铁路测量手册[K]．北京：中国铁道出版社， 1998．
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2009, Vol. 26 
