| Princess Royal Class | |
|---|---|
| One of the two preserved Princess Royals, 6201 Princess Elizabeth at Castleton East Junction signal box | |
| Power type | Steam |
| Designer | William Stanier |
| Builder | LMS Crewe Works |
| Build date | 1933 (2), 1935 (10), 1952 (1 rebuilt from Turbomotive) |
| Total produced | 13 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
36 in (910 mm) |
| Driver diameter | 78 in (2,000 mm) |
| Trailing wheel diameter |
45 in (1,100 mm) |
| Length | 74 ft 4 1⁄4 in (22.663 m) |
| Locomotive weight | 104.5 long tons (106.2 t) 110.55 long tons (112.32 t) (Turbomotive) |
| Tender weight | 54.65 long tons (55.53 t) |
| Fuel type | Coal |
| Fuel capacity | 9 long tons (9.1 t), later 10 long tons (10 t) |
| Water capacity | 4,000 imp gal (18,000 l; 4,800 US gal) |
| Boiler | LMS type 1 |
| Boiler pressure | 250 psi (1.7 MPa) superheated |
| Firegrate area | 45 sq ft (4.2 m2) |
| Heating surface: Firebox |
190 sq ft (18 m2) or 217 sq ft (20.2 m2) |
| Cylinders | 4 |
| Cylinder size | 161⁄4 × 28 in (410 × 710 mm) |
| Valve gear | Walschaerts (piston valves) 6205 had outside Walschaerts with rocking shafts operating inside valves. |
| Tractive effort | 40,285 lbf (179.20 kN) |
| Career | London, Midland & Scottish |
| Class | 7P reclassified 8P in 1951 |
| First run | 1933 |
| Withdrawn | 1952 (1), 1961 (6), 1962 (6) |
| Disposition | Two preserved, remainder scrapped |
The London, Midland and Scottish Railway (LMS) Princess Royal Class is a class of an express passenger steam locomotive 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 and two are preserved.
Contents |
When originally built, they were used to haul the famous Royal Scot train between London Euston and Glasgow Central. Two batches of locos were built; a first batch of two, and a second batch of eleven, including a single example of a version using steam turbines instead of cylinders (No.6202) – which was in its own, separate class. This Turbomotive was later rebuilt with conventional pistons, then finally destroyed in the Harrow and Wealdstone rail crash. The rest of the class were withdrawn in the early 1960s in line with British Railways' modernisation plan.
Each locomotive was named after a princess, the official name for the class was chosen because Mary, Princess Royal was the Commander-in-Chief of the Royal Scots. However, the locos 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 4-6-2 express passenger locomotive built by the LMS were of the related but larger, Princess Coronation Class.
| LMS No. |
BR No. |
Name(s) | Date Built |
Date Withdrawn |
Notes |
|---|---|---|---|---|---|
| 6200 | 46200 | The Princess Royal | July 1933 | November 1962 | . |
| 6201 | 46201 | Princess Elizabeth | November 1933 | October 1962 | Preserved. |
| 6203 | 46203 | Princess Margaret Rose | July 1935 | October 1962 | Preserved. Owned by the Princess Royal Class Locomotive Trust. |
| 6204 | 46204 | Princess Louise | July 1935 | October 1961 | . |
| 6205 | 46205 | Princess Victoria | July 1935 | November 1961 | Fitted with modified valve gear, 1947.Converted back to normal 1955 |
| 6206 | 46206 | Princess Marie Louise | August 1935 | October 1962 | . |
| 6207 | 46207 | Princess Arthur of Connaught | August 1935 | November 1961 | Appeared in the 1930s classic documentary film (Study In Steel) in which 6207 was constructed during the document film and how an LMS Princess Royal was built. |
| 6208 | 46208 | Princess Helena Victoria | August 1935 | October 1962 | . |
| 6209 | 46209 | Princess Beatrice | August 1935 | September 1962 | . |
| 6210 | 46210 | Lady Patricia | September 1935 | October 1961 | . |
| 6211 | 46211 | Queen Maud | September 1935 | October 1961 | . |
| 6212 | 46212 | Duchess of Kent | October 1935 | October 1961 | . |
Two examples, 6201 Princess Elizabeth and 6203 Princess Margaret Rose are preserved.
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