Sharing the same post
Sometimes you’ll see a signal post with both a stop arm and a distant arm. Confusing, eh? Not really.
This occurs if the following block is quite short. The stop arm will be at the top and will be the one that the driver obeys first. If it’s at danger, the train has to stop.
The distant signal underneath it is for the next stop signal. Therefore, if the stop signal is off but the distant signal is on, the driver can proceed – but knows to stop at the next signal.