Get a one-block tall wall and place two rails connected slantedly. Better powered "Powered Rail". Place a block above the slanted one in which situation this will cut the connection of Redstone. The two rails will not be cut. Run a minecart from the lower rail and see it go through the obstuction.
See MC-42414.
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Hmm... is the same on the PC version, i think Jeb or Notch confirmed that they will not fix it...
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Confirmed in Creative mode for Minecraft PE 0.9.4
Edit: Updated to 0.9.5
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It works like on pc, sadly.