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I have a rail with a T-junction. At the junction the user is given a choice of which direction to go. If they push a button they go one way, if they don't push the button they go the other way. My problem is the direction that the rail defaults to when using a button is the opposite of the direction I want it to go if you don't push anything. How can I reverse the default direction of the rail when the button is off?

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If you want to get a little more complicated, you could use a Not Gate. In a nutshell, a not gate is a logic gate which inverts a signal. Basically, if your lever is outputting a redstone signal, the not gate will not out put the signal.If a lever is in an off state, the not gate will out put a signal, achieving what you are asking.

A not gate is very simple to build. You only need to put a power source (lever, button, etc.) on a block. On any free side of the block (except the bottom face of course) you put a redstone torch. It's that simple. The redstone torch should be touching the rail, and when the lever/button/etc is flipped, the torch should turn off.

Here is an image of a simple NOT gate: A simple NOT gate

A version that fits under the ground (notice the half slab): Underground version

With this gate, the signal is inverted, therefore changing the default state of the lever/button.

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    Thank you! I swear I tried every possible combination but somehow missed this! Thanks for the detailed answer as well! – RelicCross May 31 '16 at 3:19
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    Actually I can't get the underground one working.. Do you have more screenshots of it at different angles? I must be missing something. And ya I have the half slab – RelicCross May 31 '16 at 3:32
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    @RelicCross That's because slabs do not conduct redstone signal. Instead, the rail block is being powered by stone block, which is original behavior. – QbsidianH20 May 31 '16 at 7:29

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