简述6502电气集中车站调车转线作业所形成的两种不同类型的中途返回进路。
Two different types routes for midway return operation during shunting in 6502 relay interlocking for station are illustrated.
采用这种方法不但可以准确判标签运动方向，而且可以判断标签中途返回等一些复杂逻辑。
In this way, we could not only judge the direction of movement of tags accurately, but also judge other complicated logic, e. g. the midway return of tags.
当中途爬到一半的时候，一个路过的向导告诉我们，如果不能在12：30之前到达顶峰，那么就立即返回。
Halfway up, a passing guide told us if we couldn't get to the top by 12:30 at the latest, then to turn back.
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