针对这一问题，必须采取有效的约束条件和措施，使得长度变形小于1/40 000，从而满足铁路测量精度要求。
Therefore, some necessary restricted measures should be taken to make the projection length (deformation) less than 1/40 000 in order to meet the requirement of accuracy for railway surveying.
目前铁路对测量、控制和防卫系统的要求将越来越高，这就需要有装备多支传感器的位置，并找到装备这些传感器的空间。
Today's trains are being equipped with increasing levels of measurement, control and protection systems, giving rise to multiple sensor locations and a battle to find the space for installation.
这种转变的一个副产品是一些测量经济表现的指数的相对滑落，比如电力消耗，铁路货运量，新增银行信贷。
One by-product is a fall in the relevance of indicators such as power consumption, rail-cargo volume and new bank credit in gauging economic performance.
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