Originally Posted by
JihaadJim
Alright, so you need to use normal minetracks for this, because they are the only ones that can turn. You have two tracks going off from it. It will most likely default, and the track will be going in the first direction you layed down. I'll try and do a diagram.
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Ok, so here's your rail. The slash is the bend. Say you lay down the right track first. It should just bend to that track, ignoring the other. However, to change this, you apply redstone power.
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Say the plus is a redstone torch. Because the track is receiving power, it changes to the other direction. You can utilize this, using levers hooked up to redstone wiring.
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Ok, *= lever, the dots are redstone wiring. You can hide the redstone better by going under the ground, but it's hard to show that one this diagram. So, flipping the lever outputs redstone power, we all know that, and the wiring will take the power all the way down to the intersection, where because the redstone on/off thing has changed, it will go the other direction. If you want to have the default direction (the one that doesn't need redstone power to go down) as the one that isn't default, either just leave the lever on and they'll have to turn it off to access the other direction, or make an inverter.
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Like that, at some point in the wire.
D