Minecraft - Mine cart Boosters, Switching Tracks, And Derailing.

Where is the bug ?Can you please describe the bug with words ?

And please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

Here's the crash report:

Minecraft Crash Report ----
// Would you like a cupcake?

Time: 2/3/13 1:00 PM
Description: Manually triggered debug crash

java.lang.Throwable
at net.minecraft.client.Minecraft.l(SourceFile:1172)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Thread.java:680)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [ays['robeth'/47, l='MpServer', x=-552.49, y=5.62, z=-1398.86]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-533,4,-1419), Chunk: (at 11,0,5 in -34,-89; contains blocks -544,0,-1424 to -529,255,-1409), Region: (-2,-3; contains chunks -64,-96 to -33,-65, blocks -1024,0,-1536 to -513,255,-1025)
Level time: 29593 game time, 16195 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 28 total; [py['Minecart'/2, l='MpServer', x=-528.50, y=4.52, z=-1416.50], py['Minecart'/3, l='MpServer', x=-529.50, y=4.52, z=-1401.50], py['Minecart'/4, l='MpServer', x=-530.50, y=4.52, z=-1402.50], py['Minecart'/5, l='MpServer', x=-530.50, y=4.52, z=-1402.50], py['Minecart'/6, l='MpServer', x=-529.50, y=4.52, z=-1401.50], py['Minecart'/7, l='MpServer', x=-529.50, y=4.52, z=-1401.50], py['Minecart'/8, l='MpServer', x=-529.50, y=4.52, z=-1401.50], py['Minecart'/9, l='MpServer', x=-530.50, y=4.52, z=-1402.50], py['Minecart'/10, l='MpServer', x=-525.47, y=4.36, z=-1414.78], py['Minecart'/6510, l='MpServer', x=-551.78, y=4.50, z=-1396.13], py['Minecart'/11, l='MpServer', x=-526.19, y=4.36, z=-1413.53], ays['robeth'/47, l='MpServer', x=-552.49, y=5.62, z=-1398.86], py['Minecart'/12, l='MpServer', x=-521.50, y=4.52, z=-1406.22], py['Minecart'/13, l='MpServer', x=-518.50, y=4.52, z=-1404.97], py['Minecart'/14, l='MpServer', x=-527.25, y=4.36, z=-1372.50], py['Minecart'/15, l='MpServer', x=-527.75, y=4.36, z=-1373.72], py['Minecart'/17, l='MpServer', x=-503.19, y=4.36, z=-1372.59], py['Minecart'/16, l='MpServer', x=-502.44, y=4.36, z=-1371.41], py['Minecart'/19, l='MpServer', x=-506.97, y=4.36, z=-1352.06], py['Minecart'/18, l='MpServer', x=-503.50, y=4.36, z=-1373.59], py['Minecart'/21, l='MpServer', x=-506.84, y=4.36, z=-1350.81], py['Minecart'/2932, l='MpServer', x=-551.45, y=4.50, z=-1396.04], py['Minecart'/20, l='MpServer', x=-506.38, y=4.36, z=-1349.53], py['Minecart'/23, l='MpServer', x=-507.91, y=4.36, z=-1353.28], py['Minecart'/22, l='MpServer', x=-506.97, y=4.36, z=-1350.75], py['Minecart'/8023, l='MpServer', x=-550.88, y=4.50, z=-1395.24], py['Minecart'/2822, l='MpServer', x=-551.45, y=4.50, z=-1396.04], py['Minecart'/4970, l='MpServer', x=-550.88, y=4.50, z=-1395.24]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1871)
at net.minecraft.client.Minecraft.run(SourceFile:543)
at java.lang.Thread.run(Thread.java:680)

– System Details –
Details:
Minecraft Version: 1.4.7
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_37, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 401200568 bytes (382 MB) / 581435392 bytes (554 MB) up to 4286251008 bytes (4087 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx4096M
AABB Pool Size: 32 (1792 bytes; 0 MB) allocated, 7 (392 bytes; 0 MB) used
Suspicious classes: ~_ERROR~ NoClassDefFoundError: com/pclewis/mcpatcher/mod/TileOverride$1
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 APPLE-7.32.12, Intel Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 149 (8344 bytes; 0 MB) allocated, 46 (2576 bytes; 0 MB) used

Crash Report

You have MCPatcher. This ticket is invalid as it relates to a modded or 3rd party client/server.

• Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.

• Any plugin issues need to be addressed to the plugin creator.

• This site is for addressing issues related to the base unmodded MineCraft.

Should I Try Again With A Fresh Bin?

No, Do the opposite. put a bunch of minecarts in the small circle. one on the big one.

Can you please explain with simple words what's the bug here ?

The minecarts have infinite power (bug 1) They sometimes switch/jump tracks (bug 2) sometimes they just "fall off" the track (bug 3)

watch the replicate video on how to make the booster. it doesn't show much. the other video shows how the minecarts go on for ever and a few minecarts falling off the track and also them switching from one track to another.

Aha.
The issues are already resolved by the other mods as duplicate of MC-14, MC-32 and MC-2783 .
Please review the guidelines before reporting future issues.