[MC-80895] Minecarts stop or derail on curves of tracks

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.

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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.

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). 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.

Linked issues

is duplicated by 4

MC-92063 Minecarts get stuck in curve Resolved

MC-150261 Minecart on a curve and Activator Rail on the next block results in inconsistent behavior depending on orientation Resolved

MC-165434 Minecart Bug Resolved

MC-270360 The orientation of the minecart is chaotic Resolved

Attachments

01HYTNJm0w.mp4

2024-08-23_12-49-08.mp4

Comments 22

wobst.michael 2016-10-20T23:02:00Z

Is this still an issue in the most recent versions (i.e. 1.10.2, or 16w42a) of Minecraft?

Zachary Snyder 2018-03-14T05:36:51Z

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.

Fu Chunhao 2018-05-15T15:09:59Z

This issue exists in 1.12.2 as well, especially when entering a saved world.

Fu Chunhao 2018-05-18T10:24:40Z

Please reopen this issue, it still exists in the newest versions like 1.12+.

kumasasa 2018-05-18T10:36:42Z

@unknown, the ticket is your's now, update at your need.

12 more comments

skyrising 2018-06-30T08:12:38Z

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.

Fu Chunhao 2018-07-02T07:47:41Z

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.

Patrick Elliott 2018-08-15T02:48:21Z

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 2018-11-19T19:14:53Z

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.

Fu Chunhao 2018-11-20T02:19:43Z

@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.

Happ MacDonald 2019-02-22T06:48:16Z

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. 😞

Raoul Poupart 2019-03-07T01:03:53Z

Confirm, Minecarts are only able to trave straight but not in curves. It bounces off every corner. 19w09a

[Mod] Neko 2019-03-07T01:04:44Z

@unknown: I believe your issue is MC-144605.

Rafael Costa Biasi 2021-06-14T02:57:54Z

Eventually the minecart change the tracks.

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Xge 2021-06-28T21:16:19Z

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 2022-02-08T20:50:52Z

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 2022-02-11T01:27:32Z

can confirm in 1.18.1

TomatoClownfish 2023-01-16T14:51:10Z

Can confirm in 1.19.3.

Rokmare 2023-04-24T10:59:50Z

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

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[Mod] Jingy 2023-12-14T23:53:49Z

Requesting ownership of this issue, as @unknown has not updated it since February of 2020.

LordHelix138 2024-03-03T10:14:47Z

Can still confirm for 1.19.2

[Mod] Jingy 2024-08-23T17:52:10Z

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:

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