| Prototypical Block Signal |
Lights are OFF when no train is in the track blocks. With no train in either block, both signal lights are off. A train moving into the Input-1 track block turns the Green light ON. As the train proceeds into the Input-2 track block, the Green light is turned OFF and the Red light is turned ON. When the train leaves the Input-2 track block, both lights are OFF. |
| Flashing Block Signal |
Lights flash and then turn on as a train proceeds through the track blocks. With no train in either block, the Green light, is ON and the Red light, is OFF. A train moving into the Input-1 track block starts the Green light flashing. As the train proceeds into the Input-2 track block the Green light is turned OFF and the Red light starts flashing. When the train leaves the Input-1 track block, the Red light is turned full ON. When the train leaves the Input-2 track block the Green light is turned back ON. |
| Warning Block Signal | Lights flash if a train is in a conflicting track block. The track block after the signal is connected to Input-1 . A track block which, if a train is in the block, would conflict with a train in the Input-1 block, is connected to Input-2 . The Input-2 track block can be a crossing track, or a block on the opposite side of a track switch. With no train in either block, the Green light is ON and the Red light is OFF. A train moving into the Input-1 track block: If no train is in the Input-2 track block: Relay-1 and the Green light are turned OFF. Relay-2 and the Red light are turned ON. If a train is in the Input-2 track block: Both relays and lights flash. When the train leaves the Input-1 track block, both lights are OFF. The flashing lights are intended to warn the train engineer that the train should be stopped. |
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