description LMS Princess Royal Class Overview
The LMS Princess Royal Class was a group of 12 express passenger steam locomotives designed by William Stanier for the London Midland and Scottish Railway (LMS). Introduced in 1933, these 4-6-2 Pacific locomotives represented Stanier's first express passenger design for the LMS and were named after the then-Princess Elizabeth, with the first locomotive named "Princess Royal." The class was developed to improve on the LMS's previous express locomotives, incorporating features from Stanier's experience with the Great Western Railway.
help LMS Princess Royal Class FAQ
Who designed the LMS Princess Royal Class locomotives?
The Princess Royal Class was designed by Sir William Stanier for the London Midland and Scottish Railway (LMS). Introduced in 1933, it was his very first express passenger design for the company. These locomotives were built to handle heavy passenger trains on the West Coast Main Line.
How many Princess Royal Class locomotives were built?
A total of 12 express passenger steam locomotives were built in this class. They were all named after princesses, with the first one famously named "Princess Royal" after Princess Mary. This 4-6-2 Pacific wheel arrangement set the standard for future LMS designs.
Are any of the LMS Princess Royal Class preserved today?
Yes, two of the original twelve locomotives have been preserved. The most famous surviving example is "Princess Margaret Rose," which has been operational for various heritage railways. Both surviving locomotives have seen service pulling historic excursion trains in the UK.
What was the wheel arrangement of the Princess Royal Class?
These locomotives featured a 4-6-2 Pacific wheel arrangement. This configuration provided excellent stability at high speeds, making it ideal for express passenger service. The design proved so successful that Stanier later developed the larger Princess Coronation Class based on it.
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