The Princess Royal Class was a class of a express passenger steam locomotive built by the London, Midland and Scottish Railway (LMS) and designed by William Stanier. They were pacifics (i.e. had a 4-6-2 wheel arrangement. Thirteen examples were built at Crewe Works, between 1933 and 1935. When originally built, they were used to haul the famous Royal Scot express. A single example of a version using steam turbines instead of cylinders was built as 6202 (see The Turbomotive). They were withdrawn in the early 1960s in line with British Railway's modernisation plan. Two examples, 6201 Princess Elizabeth and 46203 Princess Margaret Rose are preserved. Each locomotive was named after a princess, the official name for the class was chosen as Mary, Princess Royal was the Commander-in-Chief of the Royal Scots. However, they were known to railwaymen as "Lizzies", after the second example of the class named for Princess Elizabeth who later became Queen Elizabeth II of the United Kingdom). Later examples of express passenger locomotive built by the LMS were of the related but larger, Princess Coronation Class.
For locomotives of the Royal Scot class see LMSRoyal Scot Class; and for the first of that class see LMSRoyal Scot Class 6100 Royal Scot.
The Royal Scot is a named passenger train that runs between London Euston and Glasgow, the length of the WCML with previously a portion also going to Edinburgh.
Early on this would probably be a LNWR Precursur Class but when these were obviously obsolete for express workings by 1928 they were replaced by the new LMSRoyal Scot Class, and then pacifics of the LMSPrincessRoyalClass and LMSPrincess Coronation Class.
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