automatic block with axle counter
计划修 planned maintenance 计轴自动闭塞 automatic block with axle counter 继电并联传递网路 successively worked parallel relay network ..
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介绍了6 4D半自动闭塞改造为计轴自动站间闭塞的一种方案，对有关继电器及其电路进行了说明。
This paper introduced a plan to transform 64D semi-automatic section block into one with Axle Counter . And, it also illustrated relevant relays and its circuit.
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