The bug
While a minecart is supposed to be moving ceaselessly on a track which includes powered rails in it, it occasionally stops or derails on curves of the track in some situations.
[media]shows one situation, the three hopper minecarts in the picture were on different tracks before the bug happens. In other tests using other types of minecarts, the bug also happened: the minecarts can suddenly stop, jump onto neighbouring tracks, or jump out of the track.
How to reproduce
The bug are easy to be reproduced on multiple minecarts that run on different circular tracks placed like concentric rings (e.g.
). If we use () to represent a circular track, (()()) and ((())) are both able to reproduce the bug. Minecarts on unconcentric circular tracks like ()()() can reproduce the bug as well, but it will be harder. (On ((())) tracks, the bug can happen quite frequently.)
Note
It seems that the stopping and derailing is mainly caused by the minecarts on neighbouring tracks; the stopped minecarts can begin to run again after being passed by a minecart on the neighbouring track, and sometimes minecarts change direction after being passed by a minecart on the neighbouring track.
In situations that only one minecart is present, the bug had also been witnessed before, but it in average took a very long time to reproduce, so I cannot be certain about this.
Related issues
is duplicated by
Attachments
Comments
migrated
wobst.michael
Is this still an issue in the most recent versions (i.e. 1.10.2, or 16w42a) of Minecraft?
migrated
I can confirm that this was still an issue in 1.11.1. Unfortunately, the server that I observed this on died due to disk failure, so I can't readily give you a world file or anything.
migrated
This issue exists in 1.12.2 as well, especially when entering a saved world.
migrated
Please reopen this issue, it still exists in the newest versions like 1.12+.
kumasasa
@unknown, the ticket is your's now, update at your need.
skyrising
Hopper and chest minecarts seem to overshoot the curve if accelerated by at least 2 powered rails.
As seen in the picture they can also activate detector rails while the bounding box is off track.
migrated
In fact, this bug is not as trivial as it seems. We usually use hopper minecarts to collect things that are produced by automatic farms, but the existence of this bug means that sometimes the machine will stop functioning or not function completely for no reason, and it's quite annoying to restart the minecarts again and again.
migrated
Huh. Think I just witnessed this. Playing survival single player and found some mines. So.. I decided to spend the time to build a sorting system, borrow someone's auto-cart unloader and set up a sorter, so I can just drop anything I don't need "in" the mine into a cart, as I go through, and send it off to get everything sorted into boxes for me. It worked great, the first time I tried it, then I put a bunch of stuff in, sent it off, and.. it came back, only... I literally watched it round the corner, roll up to me, and stop, at a depowered rail with one minor problem. It was "one space" to the side of the rail, and down, from where it should be. Its like it went off the rail some place, by one square diagonally, but the game "thought" it was still on it, so it still followed the whole entire path, as it was supposed to, only.. as soon as it stopped it was all over. Had to break it, and recreate the thing to put it back on the rails.
This was using 1,13.
Silicon42
IIRC, this is that minecart derail "feature" that was added awhile back that nobody really likes. It made it so that high momentum minecarts would fly off corners as an incentive to make people have slower minecart speeds.
migrated
@Curtis Stofer, even if the derailing is intended, the minecarts still behave abnormally: in some situations they stop rather than derail, and it seems that the derailing is affected by other minecarts on neighbouring tracks.
migrated
As of 19w08b (NOT happening in 19w08a!) absolutely all minecarts at absolutely all corners (flat, no walls nearby, no other tracks or minecarts anywhere nearby) get stuck, derail, or bounce at absolutely every corner.
I tried to post a seperate bug about that but Jira just dumps me here instead, so I'll comment about it here. 😞
migrated
Confirm, Minecarts are only able to trave straight but not in curves. It bounces off every corner. 19w09a
[Mod] Neko
@unknown: I believe your issue is MC-144605.
migrated
Eventually the minecart change the tracks.
[media]
migrated
Since 1.14, minecarts derail visually (currently playing on 1.17). If you have many curves it may be that you can still enter a minecart but it's visually derailed. It's then in blocks and does not drives on the rail but still uses it. I tried building railway stations 1.14 - 1.17 and it never worked because after a few minutes they're derailing and not "using" the rails. idk how to explain this better but it's just sad to not be able to build with minecarts in this way.
aceplante
affects 1.17 Please fix mojang 😞((((
Edit, in my case there was no "adjacent rail/minecart". A chest minecart running along a single wide rail track literally just got stuck on a turn for no reason
theGlotzerify
can confirm in 1.18.1
migrated
Can confirm in 1.19.3.
migrated
In 1.19.4 bug still persist. I have 3 separate railways, 2 of those are bringing stuff In my furnace system (see image). Its not only a visual bug where I see my carts switching from bottom lane to upper lane, they also mix up materials, i find raw ores in the fuel hopper.
Not only that but I have pretty long railwais, and i keep finding carts randomly stuck at curves or switching directions
[media]
[Mod] Jingy
Requesting ownership of this issue, as @unknown has not updated it since February of 2020.
migrated
Can still confirm for 1.19.2
[Mod] Jingy
From my personal testing, I am unable to reproduce this issue in multiple different configurations with the 24w33a+ minecarts experiment. This appears to be fixed, or at least drastically improved.
Here is an example test, where no minecarts get stuck:
[media]
[Mod] Jingy