 The cylinders were altered to a near-horizontal position, compared to the angled arrangement as new; the firebox capacity was enlarged and the shape simplified; and the locomotive was given a drum smokebox.These arrangements can be seen in the engine today.Such are the changes in the engine from 1829 that "The Engineer" magazine, circa 1884, concluded that "it seems to us indisputable that the "Rocket" of 1829 and 1830 were totally different engines".