`on_undo_applied` does not fire until after the operation is complete. I need an event that fires before. Event tracing reveals no such ordinary game event.

The custom input event does in fact fire at the needed time, but only if CTRL+Z is pressed. If the undo GUI button is pressed, it does not ...

Reproduction steps:

1) Add the following prototype in data phase:

data:extend({
{
type = "custom-input",
name = "things-linked-undo",
key_sequence = "",
linked_game_control = "undo",
},
})


2) In control phase, monitor when the above custom input fires, e.g.

script.on_event("things ...

(Spawned from a discord discussion beginning here: https://discord.com/channels/139677590393716737/306402592265732098/1418345907954515989 )

In order of difficulty level:

1) By analogy with https://lua-api.factorio.com/latest/classes/LuaEntity.html#supports_direction I would like to request that ...

(In the #mod-dev-help discord channel, Bilka asked for a forum post to be made about this issue. Link to the original discord discussion: here )

We received the following multiplayer crash report:

09-11-2025, 14-34-14.png



Upon analysis, we found the crash is occurring in the `on_pre_build ...

Seconded. This could save considerably Lua time in any mod that uses combinators for gathering input.

For Project Cybersyn we have considered various workarounds, up to and including just forcing the priorities of all same-named stops to 50. Ultimately we settled on issueing a warning when a controlled train lands at a stop with priority not equal to 50.

We have simply been telling people not to ...

With the addition of the new and very helpful LuaSchedule API, I thought it would be a good time to raise this issue again. Having to use intermediating rail stops causes fundamental issues with the builtin priority and train limits systems.

Being able to schedule a train directly to a specific ...

Changed the title.

I don't think it's a duplicate, though. All of the information and developer responses in that thread are no longer valid due to the introduction of train priority. This is a new issue that was solvable in 1.1 but isn't in 2.0.

Mods that generate train schedules often want to send trains to particular stations, even in the absence of unique station names. However, train schedules send trains by station name and can't target particular stations.

In 1.x, mods like LTN would work around this by adding the coordinates of a ...