The top train could leave, and the train waiting for a berth wouldn't budge. This means it has to wait until the train directly in front of it moves out of the station before it can continue. Since the block right before the station (where the split is) was free, the block signal before the split let the train in, right before the station. Note that both stations are occupied by trains. This differs from Block Signals by one critical difference trains are kinda stupid. Every single Exit Signal has to be red for the Entry to be red. As long as a single Exit Pre-Signal is green, the Entry Signal is green. Now, the point of the Entry and Exit Pre-Signals is for efficient pathfinding. 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.Įxit Pre-Signals: Place these after the track splits. You place an Entry signal before the split. They're meant for one-way tracks that split into two or more paths. I'll explain how they work, and then afterwards how you can use them in combination.Įntry Pre-Signals: These signals work in tandem with Exit Pre-Signals. 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. This can be used to construct balancers and other helpful constructs.There are six different types of signals you can use, and can be used as two-way signals for tracks meant to go both ways, or one-way signals for tracks meant to go in only a single direction.īlock Signals: These separate track parts into "blocks", which can contain only a single train per block. For instance, entry/exit signals will cause trains to take longer routes if a path is blocked, while path signals may wait. Path signals also can behave similar to entry/exit signals, although entry/exit signals have uses that path can't fully achieve. I use path signals for forks that have 4 or more tracks, as this is where they start to benefit. This is a major advantage against standard OpenTTD signals, where you had to place signals before and after junctions, which caused trains to block junctions while waiting.įor straight track and basic merges/splits, I stick to normal one-way signals. It is not safe for a a train to wait at a signal immediately after a junction before the whole train has cleared the junction, as it would be blocking the junction while waiting, as illustrated in the example below. This is because it is only safe for a train to wait in front of a junction. The back of a Path signal is not considered a safe waiting position, and therefore paths are reserved through these signals.īecause the front of every signal is defined as a safe waiting position, you would normally not want to place a signal immediately behind a junction, only in front of a junction. Safe waiting positions are - by definition - in front of signals, depots and track ends. The Path signals are red by default, and will only show green as soon as a train can reserve a path to the next safe waiting position on its route. The two new signal types behave a bit differently than standard OpenTTD signal types. This allows 2 trains to be on the same signal block at the same time, so long as they have paths that don't cross. One-way path signals reserve an individual path between it and the next signal. One-way signals reserve a signal block between it and the next signal.
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