The experiment proved much less successful than had been hoped and in 1936 it was rebuilt along the lines of a streamlined LNER Class A4 Pacific, though it retained its Baltic wheel arrangement. After being rebuilt, the Class W1 was still easily distinguishable from an A4 at a glance, without looking for the extra trailing wheels, by the fact that it was never officially named even though the name "Pegasus" had been proposed. It therefore became known among trainspotters as the "Un-named" or "No-name Streak".