In 1926, the first of new Southern Railway designed and built locomotives emerged from Eastleigh works, the Maunsell Lord Nelson class, reputedly the most powerful 4-6-0 in Britain at the time. So successful was the Lord Nelson class that the Royal Scot class had its origins in the Maunsell design. However, the Depression of 1929 precluded further improvements in Southern Railway locomotive technology, apart from the V "Schools" class 4-4-0 and various electric designs. Maunsell also designed locomotives for use in freight yards such as that at Feltham in south west London, the final example of which was the Q class. The design of the Q class coincided with Maunsell's ill health, resulting in a conservative approach to design. The first examples were completed in 1937, the year in which Maunsell retired from the CME's position.