the Settle & Carlisle line, and workings to Perth, and on one occasion to Aberdeen. Due to boiler problems sometimes leaving them unable to provide carriage heating, they often worked freights in winter and the Royal Scot in summer. In March 1953, they were both transferred to the Southern Region to allow direct comparison to be made between them and the SR's 10201, 10202, and 10203 and remained there until spring 1955, notably working the Bournemouth Belle and occasionally through to Weymouth and Exeter, but also visiting Brighton Works. At a low point of their career in terms of reliability, they (and the SR locomotives) were sent to Derby where they were overhauled and received green livery and then ran side by side on London Midland Region duties, including the Royal Scot again in 1957–58. Classification At a meeting between the LMS and English Electric on 20 May 1946, it was agreed that a single locomotive would be equivalent to a Class 5 mixed traffic engine, and that two coupled together would be capable of handling the same loads as a Class 7 locomotive. The original power classification was 5P/5F. Upon transfer to the Southern Region (SR) in 1953, they were given the classification 6P/5F, but No. 10000 was later marked 6P/5FA. At this time, SR practice was to show the loading classification on locomotives, whereas other regions applied the statistical classification. They reverted to 5P/5F at some point after their return to the London Midland Region in 1955; only No. 10000 was marked 5P/5F; No. 10001 was marked 5P/5FA. Their final power classification, allotted in 1957, was simply 5. In 1957, the two locomotives were placed in the Type 3 power group. The classification system introduced in February 1960 for internal use by the Eastern and North Eastern Regions gave these locomotives the code D16/1; in 1962, this was amended to 16/8. Some sources place them in BR TOPS Class 34, but this is not confirmed by any official BR sources and the TOPS scheme was not introduced until several years after both examples had been scrapped. Other sources show Class 34 to have been initially allocated to the push-pull fitted members of what eventually became Class 33. Withdrawal The last allocation of both locos was at Willesden. The locomotives were laid up at Derby in 1963 with Bulleid's diesels; No. 10001 was made functional using parts of both,