Tutorials/Minecart start booster  From Minecraft Wiki Jump to:
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Construction  First you have to place the detector rail, the 4
normal rails and the 3 powered rails. Then you place 2 blocks
behind the powered rails to prevent the cart from driving off
the track. After that you have to place a block left/right of
the track and place a button on one side of the block which you
can reach when sitting in the minecart. Then you have to dig up
2 lines left/right of your track and one underneath your track.
As seen on the image, put 1 redstone dust below the detector
rail, which goes to powering 1 redstone torch of the side of a
block. That torch powers another torch, placed on top of a
block, which will then power the rails. You may also wish to
place another booster/stop point at the other end if you are
making a railway. That way you can go back and forth.  [edit]
How does it work?  If you drive to the minecart stopper you
drive above the detector rail, which sen