Chicago Mayor Rahm Emanuel will formally announce Thursday that his administration is entering one-on-one negotiations with Musk company to build the high-speed system that will utilize electric vehicles running through twin underground tunnels, said Adam Collins, the mayor’s spokesman.

The effort has been met with some skepticism from experts.

“The concept of car elevators on skates add a bunch of engineering challenges, such as reliability and safety of the elevator, loading and unloading times, and the number of dedicated areas in a city you’d need to do this at scale,” Constantine Samaras, assistant professor of civil and environmental engineering at Carnegie Mellon University, told Forbes earlier this year.
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