This is not usually used for intersection control, but rather it is used to make trains hold short of an intersection where the train might choose among multiple paths a typical use case is for entering a station with multiple platforms. An OpenTTD pre-signal (any signal marked with a yellow bar) has no concept of the "next" signal or where the train is going at all it will be green if *any* of the *explicitly marked* exit signals are green (exit signals have a vertical white bar for a plain exit, or a vertical yellow for an exit signal that is also a pre-signal). The Voxel Tycoon pre-signal will be red if the train's next signal is also red, keeping the train out of the intersection. Voxel Tycoon signals have a "pre-signal" like OpenTTD, but it works a little differently in intersections with multiple exits. VT does not have this special case, and trains will not pass a red chain signal even if they do not need a path through an occupied block. In fact, adding a station inside a chain sequence will turn the chain signals from red to blue.
However, since trains will stop at the next signal if any part of their path becomes occupied, and new trains will only enter when their path is completely free, this behavior does not cause gridlock.įactorio trains will conclude their pathfinding at a station, and will pass chain signals with no real exit if the station is within the chain sequence. This creates a sort of dependency tree, where first entered trains may have to wait for later trains to exit the intersection before continuing. Voxel Tycoon trains, on the other hand, can and will enter blocks that other trains may have already looked at when deciding whether to pass a chain signal. In addition, trains in Factorio also reserve all chain blocks they plan to traverse through in a sequence of chain blocks, up to and including the next normal block. In Voxel Tycoon, momentum takes second priority trains will stop immediately if the block they were approaching gets taken. In Factorio, trains reserve blocks ahead of them so that if their momentum carries them into another block, that block is guaranteed to be free. In particular, the way two-way tracks are designated is exactly the same. The chain and block signals in Voxel Tycoon are almost exactly the same as the chain and rail signals in Factorio. This way, the pre-signal grouping cannot be blocked forever as long as there is enough space after the exiting regular signals to fit each train.Ĭomparison with other games Factorio If this train needed to pass a pre-signal to enter the offending block, then it must be able to leave the block, thus freeing the original train. Trains can pass an initial pre-signal, only to be blocked at another pre-signal by another train. when it wants to go to a station in the middle), but there is no eventual exit after the train's path, the train will not go through. If a train does not need to pass completely through a sequence of pre-signals (i.e. The pre-signal will be green if all possible paths are free, yellow if there is at least one blocked and at least one open, and red if all paths are blocked.
FACTORIO TRAIN NO PATH FREE
This is usually used for keeping intersections free and distributing trains among platforms. The bottom train will be able to pass through the intersection with the help of the pre-signal on the right track.Ī train will pass a pre-signal if every block in the train's desired path up to and including the next regular signal is free. If it does not, repeat the process until you figure out where the problem is.Ĭheck that all of your stations and signal are on the right-hand side from the train's perspective, and that any bi-directional stretches of track have matching signals on either side of the tracks.Pre-signal keeping an intersection clear. If the train finds a path at that point, you know the problem is at that signal.
FACTORIO TRAIN NO PATH MANUAL
Switch the train to manual mode, drive forward past the next signal, then switch it to automatic mode. Some things you can do to find out where the problem lies: Same thing with signals - a train in automatic mode will refuse to pass a signal on the left-hand side of the tracks.įor a section of tracks to be bi-directional (allowing trains to travel in either direction), each signal must be accompanied by a matching signal directly opposite it on the other side of the tracks. So the next station has to be on the right-hand side of the tracks from the train's perspective. Trains always look for their goals on their right-hand side. Some things that might be causing the problem:
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