See quotation 1852.
1846. Dr. Liddon Pennock has driven by me in his rockaway without once asking me to go out with him to Holmesburg, and I felt as if I deserved it for not having written him a dozen letters since I left Philadelphia.J. R. Lowell, Letters (1894), i. 110. (N.E.D.)
1852. The long-tailed bays were left harnessed to the Rockaway,a sort of light omnibus open at the sides, and very like a char-à-banc, except that the seats run crosswise, and capable of accommodating from six to nine persons.C. A. Bristed, The Upper Ten Thousand, p. 81 (N.Y.). (Italics in the original.)