Frequently Asked Questions - Chicago
"Steel-on-steel" technology is the most reliable, proven technology available as recommended by a panel of engineering and transit professionals. Oahu voters then specifically approved a steel-on-steel rail transit system in 2008. Honolulu's light-metro rail technology is different from the old heavy elevated rail lines in New York City, Chicago, and elsewhere. The new steel-on-steel system is quiet, smooth, efficient and uses one of the most advanced control technologies in the world.