The paper introduced basic structure and principle of small sized protectiverail dry sweeper, choice and counting of main specification.
介绍一种小型干式护栏清洗车的基本结构及工作原理，同时涉及其主要技术参数的选择和计算。
2
On most of the lines, there are protective doors on the platform to prevent people from falling onto the rail, and the gap between platform and train is only about 15 centimeters or less.
大部分线路的站台上都有防护门，防止乘客坠落，站台与列车之间的缝隙不到15厘米。
3
But at the gauge face of the rail, high levels of slip and gravity inhibit the formation of protective layers.