Why isn't my detector rail igniting my TNT?

Question

I'm trying to blow my friend up on our server to get back at him :) The problem is, it doesn't work for some reason. My TNT is connected to a detector track, but it isn't activated by minecart going over that detector. Here's a video of my setup. In the video, I put the minecart on the detector. I then show you the circuit and how it doesn't ignite the TNT. I found that when the minecart stays on the trigger, it actually activates 2nd batch of TNT, which was quite a surprise, since I tested it by riding the minecart and it didn't trigger anything.

So the question is: Where is the problem on the non-exploded side of the trap? and why doesn't minecart trigger the trap at all when it just runs over the detector track?

Answer

Redstone wire is a little tricky with how it can and can't turn. Replacing the sandstone under your TNT with more TNT and running the wire straight up to that should detonate it.

Alternately, elevate your wire to the level of your TNT before it reaches it, and have the wire run straight into your lowest TNT block.

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