subway through attractions such as haunted house, small world, etc.-- sukiyaki, Dec 22 2009 tone modulated lateral grooves http://twoifbysee.b...usical-highway.htmlvibrates music through the wheels [pocmloc, Dec 24 2009] I wonder what the theoretical speed limit would be of a low profile, designated seat, roller coaster type car on subway rails ?-- wjt, Dec 23 2009 conventional subway trains through ride scenes-- sukiyaki, Dec 23 2009 The rails would be scored with lateral grooves [link]-- pocmloc, Dec 24 2009 random, halfbakery