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行车速度的提高是铁路运输质量提高和技术进步的主要标志，闸瓦压力限制速度是限制行车速度提高的关键因素，文中以沈阳铁路局管内沈阳一大连间提速为例，介绍了提高闸瓦压力限制速度的方法以及必须采取的安全措施。
The improvement of driving speed is the main symbol of railway transportation quality improvement and technological progress. The pressure limiting speed of brake shoes is the key factor to limit the driving speed increase. Taking the speed-raising of Shenyang-Dalian in Shenyang Railway Administration as an example, How to limit the speed, and the safety measures that must be taken.