The “Black Five” was Stanier's most famous design and also one of the most famous British steam locomotives ever. It was created because Stanier was of the opinion that the 2-6-0 Moguls used in power class 5 in mixed service would soon no longer be sufficient. From his time at the GWR he was familiar with the class 4900 “Hall”, which, with a 4-6-0 wheel arrangement and a driver diameter of six feet, was suitable for all trains from freight to express. Since the Hall had been developed for the re-gauged, formerly broad-gauge lines of the GWR and therefore did not fit into the loading gauge of the lines in the north, Stanier designed a slightly narrower and lighter locomotive. Since these were painted black, in contrast to the crimson the LMS had previously used, and belonged to power class 5, they were soon known as the “Black Five”. They quickly gained the image of locomotives that could be used almost anywhere and take on almost any task. They were found with freight trains as well as with heavy express trains that could travel at speeds of up to 80 mph.