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While ordinary signals simply prevent trains from entering occupied blocks, pre-signals act more like relays. They display the same indication as the next block down the track, while also protecting their own. They have three possible indications - red and green, same as a block signal, but also yellow, which is more complex but has powerful implications.
When used at junctions, pre-signals can be used to govern multiple paths. They show green when all paths are clear, yellow when one or more are occupied, and red when all are occupied. A train arriving at this signal will not proceed until the specific route it's taking through the junction has a clear block, allowing for even the most complicated track layouts to function safely.
When used at junctions, pre-signals can be used to govern multiple paths. They show green when all paths are clear, yellow when one or more are occupied, and red when all are occupied. A train arriving at this signal will not proceed until the specific route it's taking through the junction has a clear block, allowing for even the most complicated track layouts to function safely.
虽然普通信号只是阻止火车进入占用的区域,但预警信号灯的作用更像是中继。 它们显示与下一个区域相同的信号,同时也保护自己。它们具有三种信号灯-红色、绿色(与区域信号相同),以及黄色(比较繁忙时,影响比较大)。
在枢纽处使用时,预警信号灯预信号能用来管辖多条道路。所有道路畅通时显示绿色,一条或多条繁忙时显示黄色,全部繁忙时显示红色。开往此信号灯的火车在其路线上的轨道区段畅通之前无法前行,再复杂的布局,也能在它们的协调下安全运作。
在枢纽处使用时,预警信号灯预信号能用来管辖多条道路。所有道路畅通时显示绿色,一条或多条繁忙时显示黄色,全部繁忙时显示红色。开往此信号灯的火车在其路线上的轨道区段畅通之前无法前行,再复杂的布局,也能在它们的协调下安全运作。
While ordinary signals simply prevent trains from entering occupied blocks, pre-signals act more like relays. They display the same indication as the next block down the track, while also protecting their own. They have three possible indications - red and green, same as a block signal, but also yellow, which is more complex but has powerful implications.
When used at junctions, pre-signals can be used to govern multiple paths. They show green when all paths are clear, yellow when one or more are occupied, and red when all are occupied. A train arriving at this signal will not proceed until the specific route it's taking through the junction has a clear block, allowing for even the most complicated track layouts to function safely.
When used at junctions, pre-signals can be used to govern multiple paths. They show green when all paths are clear, yellow when one or more are occupied, and red when all are occupied. A train arriving at this signal will not proceed until the specific route it's taking through the junction has a clear block, allowing for even the most complicated track layouts to function safely.
虽然普通信号只是阻止火车进入占用的区域,但预警信号灯的作用更像是中继。 它们显示与下一个区域相同的信号,同时也保护自己。它们具有三种信号灯-红色、绿色(与区域信号相同),以及黄色(比较繁忙时,影响比较大)。
在枢纽处使用时,预警信号灯预信号能用来管辖多条道路。所有道路畅通时显示绿色,一条或多条繁忙时显示黄色,全部繁忙时显示红色。开往此信号灯的火车在其路线上的轨道区段畅通之前无法前行,再复杂的布局,也能在它们的协调下安全运作。
在枢纽处使用时,预警信号灯预信号能用来管辖多条道路。所有道路畅通时显示绿色,一条或多条繁忙时显示黄色,全部繁忙时显示红色。开往此信号灯的火车在其路线上的轨道区段畅通之前无法前行,再复杂的布局,也能在它们的协调下安全运作。
When used at junctions, pre-signals can be used to govern multiple paths. They show green when all paths are clear, yellow when one or more are occupied, and red when all are occupied. A train arriving at this signal will not proceed until the specific route it's taking through the junction has a clear block, allowing for even the most complicated track layouts to function safely.
灯的作用更像是中继。 它们显示与下一个区域相同的信号,同时也保护自己。它们具有三种信号灯-红色、绿色(与区域信号相同),以及黄色(比较繁忙时,影响比较大)。在枢纽处使用时,预警信号灯的预信号能用来管辖多条道路。所有道路畅通时显示绿色,一条或多条繁忙时显示黄色,全部繁忙时显示红色。开往此信号灯方向的火车在其路线上的轨道区段畅通之前无法前行,再复杂的布局,也能在它们的协调下安全运作。