Definition of "elevated"

‘I hope,’ said Mr. Pickwick, ‘that our volatile friend is committing no absurdities in that dickey behind.’‘Oh dear, no,’ replied Ben Allen. ‘Except when he’s elevated, Bob’s the quietest creature breathing.’

1836 March – 1837 October, Charles Dickens, “(please specify the chapter name)”, in The Posthumous Papers of the Pickwick Club, London: Chapman and Hall, […], published 1837

Mr. Nunheim's home was on the fourth floor of a dark, damp, and smelly building made noisy by the Sixth Avenue elevated.

1934, Dashiell Hammett, chapter 16, in The Thin Man‎, New York: Knopf

While the New York, Fordham, and Bronx Railway never built any elevateds, its franchise rights were valuable.

2012, Roger P. Roess, Gene Sansone, The Wheels That Drove New York