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At the risk of sounding too funny, how about using dynamite? Check your home insurance policy first! NO, I'm just kidding.. Using concrete blocks sounds like a good idea, if you don't want a "permanent" tunnel, just don't use mortar on the blocks. I don't know if your tunnel will be straight, or curved. If it is to be straight, you might want to use PVC pipe of the appropraite diameter. Consider the length of the pipe, and pre-mount track on a 2X6 plank, then slip the assembled track into the tunnel after all else is ready. <br /> Just an idea...
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