Monorail

Monorail = a railroad in which the track consists of a single rail, typically elevated

Elsewhere on the Web
monorails.org

Embedded Tweets

How Vegas would look if they'd extended the monorail to the airport pic.twitter.com/51L1SEx79d
— Las Vegas Locally 🌴 (@LasVegasLocally) May 8, 2019

Wikipedia
Monorail

Planeta.com

Las Vegas Monorail

Public Transportation