Gravity Train, one ticket to hell please!

Right here's how I understand this if you were to go directly through the centre of the earth: Technically (with little technical knowledge of the subject) the speed you gather on your journey to the centre will be and equal and opposite force to slow you down on the journey out the other side; as long as you take that pesky wind resistance out of the equation, your body could travel at 7900 meters every second. Naturally you'd die a rather painful death from the immense pressure gathered from a gravitational decent of several thousand miles but you'd be at your destination in 42 minutes, even if you were the size of a squashed walnut.

EDIT: Hang on...no that's not right, you'd become weightless the closer you got to the centre! So it'd only be the incredible heat from the centre of the earth to *worry* about.

Here's the link to gain your own view before it's introduced in say... the year 2109

http://en.wikipedia.org/wiki/Gravity_train

I wonder what the planning permission of this kind of thing is? I'm assuming that tunnelling into the centre of the earth could cause some pretty disastrous volcanoes? That'd be hard to explain.