[MC-6311] Minecarts don't bounce off redstone blocks when on powered rail Created: 05/Jan/13  Updated: 23/Aug/24

Status: Reopened
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Snapshot 13w01b, 1.16.4, 20w49a, 20w51a, 1.16.5, 21w05b, 21w06a, 21w07a, 21w11a, 21w13a, 21w14a, 21w15a, 21w16a, 21w17a, 21w18a, 21w19a, 21w20a, 1.17 Release Candidate 2, 1.17, 1.17.1, 21w40a, 1.18.1, 1.18.2, 22w19a, 1.19.2, 1.21, 24w34a
Fix Version/s: None

Type: Bug
Reporter: Aaron Herbst Assignee: Unassigned
Resolution: Unresolved Votes: 16
Labels: minecart, powered_rail, redstone_block

Attachments: PNG File 2013-01-05_15.07.17.png     PNG File 2022-10-16_23.49.17.png     PNG File 2022-10-16_23.49.32.png     PNG File 2022-10-16_23.50.37.png     File MC-6311.mp4     PNG File minecart redstone block bounce.png     PNG File minecart redstone block no-bounce.png    
Issue Links:
Duplicate
is duplicated by MC-137629 Minecarts stop at the end of tracks Resolved
is duplicated by MC-149145 Minecart won't push off of redstone b... Resolved
is duplicated by MC-182364 minecart is no turn when wall is reds... Resolved
is duplicated by MC-203675 Minecarts not bouncing off redstone b... Resolved
is duplicated by MC-203769 Minecart wont bounce directly into water Resolved
Relates
relates to MC-171903 Back of stair blocks fail to accelera... Open
relates to MC-198162 Minecart on powered rail can only sta... Resolved
CHK:
Confirmation Status: Confirmed
Category:
Minecart, Redstone
Mojang Priority: Low
Area: Gameplay

 Description   

The Bug

The minecart rides down a powered rail and stops at the redstone block instead bouncing off and getting sent in the other direction. Also applies to minecarts that are standing still on the powered rail.

How to reproduce

  1. Place a line of three rails
  2. Place a powered rail on both ends
  3. Place a redstone block behind one end (right side in screenshot)
  4. On the other end (left side in screenshot), place a redstone block on the side and a different solid block on the end
  5. Now place a minecart on the left powered rail
    Notice the minecart starts to ride to the other side
    also notice that it stops against the redstone block
  6. Remove the cart and place another on the right powered rail
    Notice the minecart stands still



 Comments   
Comment by Connor Steppie [ 16/Oct/22 ]

Can confirm in 1.19.2:

Comment by [Mod] Avoma [ 15/May/22 ]

Can confirm in 1.18.2 and 22w19a.

Comment by user-f2760 (Inactive) [ 30/Jan/22 ]

Mojang has triaged this, so yes, it IS a bug.

Comment by purpledragonnuke [ 30/Jan/22 ]

This isn't a bug, minecarts only bounce off solid blocks, and redstone blocks are transparent.

Comment by Steve W [ 13/Jan/22 ]

This bug affects 1.18.1 as well.

When a Minecart is moving on a Powered Rail, one of the final checks it does is to see if it will bounce off of a wall. The function it uses for this check will let the Minecart bounce off if the block in question is considered a "solid block." For most blocks, there are two requirements to be a solid block:

  • The block's material must block light
  • The block must be a full cube

However, a block can be explicitly set not to be considered solid even if it otherwise meets the above requirements. Blocks set this way include:

  • Glass of all types
  • Beacon
  • Redstone Block
  • Observer
  • Piston (even retracted Pistons will stop a Minecart)

Glass and Beacons already fail the first check of blocking light. I assume that the rest were made non-solid for use in redstone contraptions. There are also a couple of odd blocks out:

  • TNT stops Minecarts (its material doesn't block light)
  • Soul Sand is explicitly set as a solid block, so Minecarts will bounce off

Possible fix: Modify the Minecart bounce-off check to work with full cube blocks. Replacing the check outright might make Soul Sand no longer work as it is hardcoded as solid and is not a full cube.

Comment by aceplante [ 11/Jan/22 ]

affects 1.17 and happens with glass too

Comment by Marty McFly [ 12/Oct/21 ]

Affects 21w40a

Comment by [Mod] Avoma [ 29/Mar/21 ]

Can confirm in 21w11a.

Comment by [Mod] Avoma [ 20/Feb/21 ]

Video attached.

Comment by [Mod] Avoma [ 18/Feb/21 ]

Can confirm in 21w07a.

Comment by [Mod] Avoma [ 12/Feb/21 ]

Can confirm in 21w06a.

Comment by [Mod] Avoma [ 04/Feb/21 ]

Can confirm in 21w05b.

Comment by Tails [ 24/Jan/13 ]

For feature suggestions/changes please use the MineCraft Forums: Suggestions.

Comment by Aaron Herbst [ 24/Jan/13 ]

I would say that because the redstone block is in the shape of a solid block, it should behave like a solid block. It doesn't really make sense how it is IMHO.

Comment by Tails [ 07/Jan/13 ]

Redstone is a transparent block. Minecarts only bounce off of solid blocks.

Comment by Kumasasa [ 05/Jan/13 ]

Confirmed.

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