If the block is open, they display a green light/bar is up. They function exactly like Block Signals, and "reserve" the block after the signal for a single train. Ideally right after, to minimize the amount of time the block remains in use. The closer you place it to the split, the less time the block will be in use. They're meant for one-way tracks that split into two or more paths. : These signals work in tandem with Exit Pre-Signals. I'll explain how they work, and then afterwards how you can use them in combination. They're really meant for one-way tracks, so I wouldn't recommend using them for two-way tracks. They work like Block Signals, so they divide the track into blocks, but take their input from signals further down the line. Pre-signals need a bit of explanation before telling you how they work. If for some reason a train hits the wrong side of a block signal, it will stop and turn around, as it thinks it's going the wrong way down the track. If a train hits a block signal that already has a train, it will be stopped, and wait for the track to clear before proceeding. Less if the average train size is smaller. For efficiency, you'll want them roughly 10 blocks long. These blocks can be as large as you want, or as small. : These separate track parts into "blocks", which can contain only a single train per block. There are six different types of signals you can use, and can be used as two-wa y signals for tracks meant to go both ways, or one-way signals for tracks meant to go in only a single direction.
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