I worked in an agency that had one of these in germany. You are not allowed to build new ones but the ones that are installed can still be used. It's kinda scary for the first three or four times but after that it's an amazing use of transportation in an office. The thing that most people freaks out is going over the turn because everything is dark and you see the motors directly in front of your face.
We dressed ours up as tunnel of horror on halloween, good times.
We dressed ours up as tunnel of horror on halloween, good times.