Myth's Mk2 SMP 4-Way Minecart Junction for Minecraft /w Schematic
Channel: Mythtri
Date: 2012-02-10

** Best viewed with annotations ON **

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Mk3 design available at 
http://www.youtube.com/watch?v=u-fELJWTMEc 
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This is fairly similar in operation to my single player MK2. 

This video shows my Mk2 iteration of my 4-way minecart junction for dual rails. That is, a junction where each direction has one rail for inbound traffic and one rail for outbound. This version is essentially the same as my MK2 design, but with an added queuing system to make it usable in SMP (survival mulit-player) games.

Features:

- Once a player presses a button, all buttons are disabled so that only one cart can enter the loop at a time.
- All buttons are enabled as a cart leaves the loop.
- If the buttons are disabled and a cart fails to leave the loop, the buttons will automatically reset
- Minecart queue at each entry point. Each queue can be easily expanded using MCEdit and by following the notices on the outside of each tunnel.


MCEdit schematics including "construction kit":
http://www.mediafire.com/?6bho36szv9bwv2b

Note: When importing this schematic you need to be careful with the orientation (rotating the schematic will v.likely break it). Also, you need to be careful in placing boosters on the lines arriving at the junction. If the boosters are too close to the junction, the minecart will overshoot. Suggested distance between the arrival point and the inbound booster is 25 non-boosted rails.

Addendum: South-East rule:
http://www.minecraftwiki.net/wiki/Rail#South-East_Rule

If you haven't used MCEdit before, it's probably worth checking out some MCEdit tutorial videos. I recommend Tyken132's tutorial: http://www.youtube.com/watch?v=o5FxiJuaMPo



Credits:

Royalty free music: "Big Daddy" from "Demo" by Fonetik 
http://www.jamendo.com/en/album/2336

Minecart queuing solution: Based on Skott1e's design
http://www.youtube.com/watch?v=muT9vvQnVaA

Game: Minecraft Release 1.1
http://www.minecraft.net

Texture: Painterly Pack
http://painterlypack.net/customizer.php

Video Capture: Fraps
http://fraps.com/

Video Editting Software: Windows Live Movie Maker
http://explore.live.com/windows-live-movie-maker