What If We Dug A Tunnel Through The Earth?

What about an above-ground gravity train? It could even be a part of a space elevator setup.

so... if connect anything with a gravity train... it should be the best source of beer (Germany) with the best pizza (Italy)... OOooo... better yet!!!! Lets just dig one half way from Washing DC to the mantle! LMFAO

just imagine doing a long distant 17 hour flight before they had internet! horrible piped in music from cheap plastic reused crappy headsets that were like a crappy stolen stethoscope taken off a homeless person who hadn't bathed in a year, and had all the stereophonic sound as one too (the homeless person OR the stethoscope). horrible movies. horrible food. screaming babies. screaming flight attendants. screaming heebie jeebies from bathrooms that were smaller than your luggage, & far less clean. threats of watery coffee. threats of "no more alcohol". threats because you're running around nekkid trying to squeeze into the overhead compartment for some peace and quiet, and you can't do that with your clothes on. threats of hijacking... ah... the good ole days of flight!