![]() In this case, the next train will move up to the topmost platform, and the first entry pre-signal will turn red, preventing any more trains from entering the tracks between the exit and entry pre-signals until at least one of the four have moved off. It's useful if you have a large station with many more branches, like the one shown in the wiki: ![]() This is clearly inefficient, which is where pre-signals come in.īy placing an entry pre-signal at point A, and exit pre-signals at the two tracks at B, you can tell the trains to enter A only if the track after any one of the exit pre-signals at B is clear, thus resolving the situation mentioned earlier.Ī combo pre-signal is basically a combination of the two. This is bad because if the train from the other platform were to finish and move off first, the train will still be stuck behind the other train, unable to move. If you use normal block signal here, and both platforms are occupied, the signal at A will be green, allowing the next train that comes along to move into the track between A and B. Say you have a station with two platforms, and two sets of signals A and B. The best way to illustrate this would be to use an example. Only one direction needs pre-signal functionality.Ĭan anyone please provide a clearer explanation, and perhaps tell me how do Exit and Combo relate to it? This is convenient for bi-directional pre-signals where The block directly behind the entry pre-signal, it behaves as a normalīlock signal. If there are no signals designated as exits on Note thatĭepots have a built-in two way signal (it works as an entry pre-signal My favorite type of station to use is a 'Ro-Ro' station where trains entering and leaving dont interfere with each other. This prevents trains from entering theīlock until there is an available exit and obstructing it. The following block, unless there is at least one green exit signal on So here's what it says on Entry signals: Block Entry Pre-signalĪn entry pre-signal prevents trains from entering The interval of the signals (when built automatically) can be set up in the bottom right of the signal selection toolbar. I'm trying to (and failing) to understand the Entry signal, (and subsequently, the Exit and Combo signals, because Exit "Works the same as Entry but." and Combo "Combines Entry and Exit"). Doing so while holding down CTRL, it's enough to drag the mouse just one field in the respective direction - OpenTTD will then build the signals automatically till the next junction, station or the end of the line. I'm reading their Signals article on their wiki, and it's still not 100% clear to me.
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