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Although tradition is suggested by the dedication to Hugh, 2nd Duke of Northumberland, this copperplate engraving is a map of changes, as very much is the cartouche with its drawing of a full coal wagon moving down the railway to the riverside wharf, the horse acting from behind as a brake, while an empty wagon to the left is pulled up the slope by its horse.
— A History of the Railroad in 100 Maps by Jeremy Black (Page 18)
new vocabulary: cartouche
None of these definitions seem to apply, though I spose the frame definition is closest. the image described is an inset within a frame. 1: a gun cartridge with a paper case
2: an ornate or ornamental frame
3: an oval or oblong figure (as on ancient Egyptian monuments) enclosing a sovereign's name