 After service on the L&MR, "Rocket" was used between 1836 and 1840 on Lord Carlisle's Railway near Brampton, in Cumberland (now Cumbria), England.Built as a prototype to win a speed trial, the engine was soon superseded by improved designs, such as Stephenson's "Northumbrian" and "Planet" designs, both of 1830.Within a few years, the "Rocket" itself had been much modified to be similar to the "Northumbrian" class.