There are some more examples for path signals at the wiki you linked to. With path signals, the second train won't even slow down it succeeded in reserving the bottom lane, so away it goes. If you were only using block signals, the second train would be held up until the first train clears the junction, even if it's not using the bottom lane. This picture does a pretty good job of explaining it: If it succeeds in reserving the track, it will use it, even if another train is inside the "block". What they do is allow a train to "reserve" a section of track before it gets to it. Path signals are exclusive to OpenTTD they were never in Transport Tycoon Deluxe. For the most part, there's no real reason to use Combo Signals. Note that you can just use entry and exit pre-signals as well remove the Combo signals, and it will function just the same. By layering it like this, the train is still held up before committing to any track that might cause it to rely on a train to leave the station. This picture shows a good example of when to use Combo Pre-Signals:Īt one track, there's an Entry Signal, getting it's signal from the two Combo Signals right after it, and they, in turn, are getting their signals from each of their two Exit Signals. You'd use an Entry before any of the splits happen, Exit Signals after all the splits are done, and Combos in between. They're meant to be used if you have a large number of splits in a short area. It'll be first come, first serve.Ĭombo Pre-Signals: These work like both Entry and Exit Pre-Signals. That means as soon as either station track is clear, it can advance, and won't necessarily wait for the bottom track. It's stuck, and will hold up the entire track until the bottom train moves.īut if you use the Pre-Signals, the train waits before the split. 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. 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.
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