 The successful 2-2-0 locomotive "Planet" (1830) had internal front-mounted cylinders set to the horizontal.Engines built to the "Planet" design and the subsequent 2-2-2 "Patentee" design of 1833 made the design of "Rocket" obsolete.On 20 April 1829 the board of the Liverpool and Manchester Railway project passed a resolution for a competition to be held to prove their railway could be reliably operated by steam locomotives, there being advice from eminent engineers of the age that stationary engines would be required.