This is also valid with path-based signalling, although it makes a different impression. In this case, use waypoints to improve your network.Ī train does not plan ahead which way to go! It does decide its route on every switch it encounters. However, this may result in trains going the wrong way because the path takes them nearer, but not to their destination, and they may get stuck somewhere. If the destination is farther away, the train will take the way that will take it closest to the destination. If pathfinding finds a route to the destination within that look-ahead, the train will take the route leading there. This look-ahead is limited, it will stop after seven junction tiles or 64 squares, whatever happens first. Every time a train arrives at a switch, it will look ahead to choose where to go. Pathfinding in TTDX and TTDPatch roughly works as follows: The train itself knows its own position and the position of its destination.

as soon as you build junctions and signals a train will not move without the results of both processes. Usually, both processes are connected in various ways, i.e. Think of a moving train as the result of two processes: pathfinding tells the train where to go, and the signals tell the train when to go. Quite easy to understand, actually.īefore discussing the influence of signals on the behaviour of trains it is important to take a short look at their pathfinding. A closed door in this sense is the same as a signal showing 'Stop!'. Doors may be closed at any time, usually because somebody else is in the chamber behind that door and only one person per chamber is allowed. Any door through which one can enter a chamber is equivalent to an entry signal, at the same time one can leave the other chamber through said door, which is the equivalent to an exit signal. In other words: Each chamber is a signal block, each door is a signal. Just in case you did not understand what I wrote just above, I'll try to give an example: Imagine a huge labyrinth of chambers. The actual type of the signal is unimportant in that respect (it is important for efficient signalling, though)! entry/exit signal Entry signals are all signals that lead into a signal block, exit signals lead out of the block.Īll signals are entry signals and exit signals at the same time (exit from one block means entry into another block).

There can also be blocks without entry/exit signals, so that trains cannot enter/leave the block, but these setups do not any have practical relevance. There can be up to 255 signals for a signal block, which should be more than enough. To understand the theories in the following paragraphs, it is necessary to know some terms: signal block A signal block consists of all pieces of track between entry signals and exit signals.

Openttd signals station bypass