站内电码化电路的一点改进郑春风＊图１上行接近示意图图２上行接近发码局部电路图如图１所示，当列车压入并出清上行第二接近轨道区段时，其轨道电路不能复原。其原因是，当列车压入第一接近轨道区段时，ＳＪＧ１Ｊ继电器落下，使ＳＪＧ１ＦＪ继电器励磁，向第一接近区段... Figure 1 Upstream Proximity Schematic Figure 2 Uplink Proximity Code Partial Circuit As shown in Figure 1, when the train presses in and clears the up-going second closest track section, its track circuit can not be restored . The reason for this is that when the train is pressed into the first approach rail section, the SJG1J relay falls, causing the SJG1FJ relay to energize toward the first proximity section.