Powered rail not powering down

I've built an underground minecart track to allow me fast travel between two outposts. In the middle I've placed a powered rail, with a long redstone line to each post. I connected these two to a device with two inputs, and one output. When one of the inputs change, so does the output, effectively allowing me to turn the underground powered rail on and off from my outposts, acting sort of as a station. I recently hooked up this device's output to the input of another one of these devices, making the other input a lever so that I may also control the power to the rail from underground.

It powers up perfectly, but when I try to turn it off, it simply won't, even when destroying all redstone wires to it. How can I fix this?

Solution 1:

It sounds like a problem with this 2in/1out "device". I would do two things:

1) Try setting it all up in a smaller area and see if the problem persists. There might be some game bug or design flaw caused by the long distance. Also it will be easier to do "debugging" on the circuits if it's all collected in one place.

2) Post a schematic of the device since it is very hard to help without seeing the actual circuits.

Update:

From patch notes for latest patch 1.7.3

Booster rails are no longer being powered magically without a power source

So updating your client might fix the problem now.

Solution 2:

From the Bugs section of the powered minecarts page over at the Minecraft wiki,

• When you power a track, 8 tracks in both directions (excluding the track being powered) will be powered.

• If you place a powered rail 1 block above 2 powered rails at a corner, the powered rail at the corner becomes powered

Either of these could cause the behavior you describe.