Disorient Express 2: The Ride Deepens

For my next coaster, something similar to, but quite different from, the first:

You ride in the same type of car as in the original <plug type="shameless">Disorient Express (see link)</plug>. Starting out on a flat track section, you go up a 300-foot-tall incline, and face certain doom: a 600-foot vertical drop, straight into the dirt. Only 50 feet (at >100 miles per hour) from the ground do you see the tiny, just-barely-fits tunnel entrance which gulps you down. And down. And down. In total darkness, you can feel and hear both the acceleration as gravity pulls you to over 250 miles per hour, and the temperature as you go ever deeper (if you're not sweating now, you will). Where DOES it end?

Violent (but not brain-killing) shaking jars you around. Then barrel rolls, and other disorienting tricks,...uh...disorient you. You're whipped around to the up direction again. Finally, it's ending. NOT!

The track wasn't finished, you realize as the incredibly realistically-designed hill curves back down (still in darkness) and you hurtle down (what seems to be) a bottomless pit. After sufficient evidence to convince you you're a goner, you're brought back up to the real end of the ride. Of course, you have to rocket into the hillside, as with the first one, to go back to the station.

This would require extensive tunnels lined with reinforced concrete, built to withstand the heat and pressure of 'way down there' (which happens to be about 2-4 times as deep as the first Express goes). Also, the wheels and bearings would have to be from jet engines or something, just like from the original. However, it doesn't need a 2000-foot-high cliff, therefore it can be built in a more convenient location (closer to a major city).

All in all, it is a thrill ride like no other.