Elevated railway
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An elevated railway or elevated train is a railway with the tracks above street level on a viaduct or other elevated structure. The railway may be a broad-gauge, standard-gauge or narrow-gauge railway
A Chicago "L" train
Liverpool Overhead Railway, 1911
Six O'Clock, Winter, by John Sloan, depicting Chicago's L Train. Painted 1912.
Two Wuppertal Schwebebahn trains
Monorail
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A monorail is a form of urban rail transit in which trains run on or are suspended from a single rail or beam. Monorails typically provide intermediate transport capacity, generally greater than trams
Elevated railway
…from steel, cast iron, concrete, or bricks). The railway may be a broad-gauge, standard-gauge or narrow-gauge railway, rapid transit, light rail, monorail, or a suspension railway. Elevated railways are normally found in urban areas that would otherwise require impracticably many level crossings. Usually…
Monorail on concrete columns in Chongqing, China
Gyroscopically balanced monorail (1909) by Brennan and Scherl
"Popular Science" February 1934, p. 41: "A new Russian type of monorail that runs in a chute on large spheres."
Seattle Monorail, built in 1962 and still using the original ALWEG trains