For the opening of Austria's first steam-powered railway, the Kaiser-Ferdinands-Nordbahn ordered two two-axle steam locomotives from Stephenson in Newcastle. They were of a standard type offered at the time and had a rear driven axle with five foot wheels. The locomotive “Austria” had actually been built in 1834 for an order by an American customer and then been set aside. It was now taken for the KFNB's order and a second locomotive, named “Moravia”, was built new.

After a voyage across the Atlantic and the Mediterranean, they were unloaded in Trieste and transported across the Semmering by horse-drawn carriage. After all, “Austria” was the locomotive that undertook the first test run on the line between Floridsdorf and Deutsch-Wagram on November 13, 1837. It is therefore considered the first steam locomotive that ran in Austria. A memorial in Deutsch-Wagram has been commemorating this journey since 1987.

With their 20 hp, they were soon too weak for most tasks. As a result, they had to hand over more and more services to the three-axle locomotives ordered directly after them. Since the operation of two-axle locomotives in Austria was forbidden after a serious accident in France in 1842 and a conversion to three-axle locomotives was not possible, they were soon withdrawn and scrapped.

After a few months in service with the “Rocket”, Stephenson used the experiences to develop an improved successor. Since the placement of the cylinders of the predecessor was unfavorable for the running characteristics, the driving axle was moved to the rear and the cylinders were installed horizontally in front of the driving axle and inside the frame. It was probably the first locomotive with this arrangement, which later became the standard.

This arrangement not only improved the running characteristics, but also allowed the cylinders to be mounted inside the smokebox, thereby reducing losses from condensation. Also new was a steam dome, with which dryer steam could be extracted from the boiler. In addition, the front and rear buffers and couplers were roughly in the places where they are today.

On November 23, 1830, it was able to prove its performances by completing the 31 miles from Liverpool to Manchester in about an hour. The prototype was followed by six more by Stephenson and three made by Fenton, Murray and Jackson to the same design.

In the years that followed, many locomotives were built in several countries based on the “Planet” pattern, so that the 2-2-0 wheel arrangement was later named after it. The Liverpool & Manchester alone got 16 of them. The original “Planet” was first modernized in 1833 and retired in 1840. A replica that was built in 1992 was used regularly until 2017.

One of the most significant locomotives of all times was the „Rocket”, built in 1829 by George and Robert Stephenson for the Rainhill Trials which were held by the Liverpool & Manchester Railway. In these trials, the L&MR wanted to determine the design for a locomotive that could successfully operate light passenger trains over longer distances. The new locomotive had to achieve an average speed of 10 mph (16 km/h) over the 70 miles from Liverpool to Manchester and back. The limit for four-wheeled locomotives was set to four and a half tons, while six-wheeled locomotives were limited to six tons.

Since the Stephensons recognized that a single driving axle would be enough for the light trains, they chose the 0-2-2 wheel arrangement for the first time. In this case the driving axle was at the front and the cylinders were mounted behind it at an angle of 38 degrees. The rear wheels were not connected to the driving wheels and only carried the weight of the firebox. 

The boiler had many features which could be found on later steam locomotives. Instead of a single or two flues, it had 25 tubes which created more surface for the smoke to heat the water. These worked great in conjunction with the blast pipe to provide enough draught. Additionally, the firebox had a water jacket to utilize the direct radiant heat from the hottest part of the boiler.

“Rocket” easily won against its rivals in October 1829 and so the Stephensons could share the £500 prize with Henry Booth from the L&MR, who had provided valuable input for the design. It took part in the opening of the railway on September 15, 1830 when the Stephensons had already built the even more advanced “Northumbrian”. The event was overshadowed from an accident in which “Rocket” struck and killed William Huskisson, the MP for Liverpool.

In 1831, when some similar locomotives had already been built, the cylinders of “Rocket” were mounted in a more horizontal way to match “Northumbrian”. It was used on the L&MR until 1834 and then it was unsuccessfully used by Thomas Cochrane to test steam turbines. Rebuilt back to conventional cylinders, it was sold to the Brampton Railway in 1836 and used there until 1840.

After a period of storage, it was donated to the Patent Office Museum (Science Museum) at London in 1862, where it rested until 2018. After some time in the NRM at York, it came to Shildon in 2023. Over the years, several working and stationary replicas have been built. The most popular replica was built for the 150th anniversary in 1979. The original locomotive can today be seen with its nearly horizontal cylinders, while this replica still has them inclined by 38 degrees.