| Powertype: | Steam |
| LMS Stanier Class 4P 2-cylinder 2-6-4T | |
| Designer: | William Stanier |
| Builddate: | 1935–1943 |
| Totalproduction: | 206 |
| Whytetype: | 2-6-4T |
| Uicclass: | 1′C2′ h2t |
| Leadingdiameter: | 3feet |
| Driverdiameter: | 5feet |
| Trailingdiameter: | 3feet |
| Wheelbase: | 38feet |
| Length: | 47feet |
| Locoweight: | 87.85abbr=onNaNabbr=on |
| Fuelcap: | 3.5LT |
| Watercap: | 2000impgal |
| Boiler: | LMS type 4C |
| Boilerpressure: | 200abbr=onNaNabbr=on |
| Firearea: | NaNsquare feet |
| Tubesandflues: | 1126or |
| Fireboxarea: | 139or |
| Superheaterarea: | 185to |
| Cylindercount: | Two, outside |
| Cylindersize: | NaNinchesx26inchesin (xin) |
| Valvegear: | Walschaerts |
| Tractiveeffort: | 24670abbr=onNaNabbr=on |
| Withdrawndate: | 1960–1967 |
| Disposition: | All scrapped |
Sir William Stanier's London, Midland and Scottish Railway (LMS) Class 4P 2-Cylinder 2-6-4T was a class of 206 steam locomotive built between 1935 and 1943. They were based on his LMS 3-Cylinder 2-6-4T.
| numbers | Lot No. | date built | Built at | ||
|---|---|---|---|---|---|
| LMS | BR | ||||
| 2425–75 | 42425–75 | 128 | 1937 | Derby | |
| 2476–94 | 42476–94 | 128 | 1936 | Derby | |
| 2537–44 | 42537–44 | 127 | 1935 | Derby | |
| 2545–2609 | 42545–609 | 133 | 1936 | North British 24301–365 | |
| 2610–17 | 42610–17 | 133 | 1937 | North British 24366–373 | |
| 2618–51 | 42618–51 | 144 | 1938 | Derby | |
| 2652 | 42652 | 144 | 1939 | Derby | |
| 2653 | 42653 | 148 | 1940 | Derby | |
| 2654–62 | 42654–62 | 148 | 1941 | Derby | |
| 2663–70 | 42663–70 | 148 | 1942 | Derby | |
| 2671/2 | 42671/2 | 148 | 1943 | Derby | |
The LMS numbered them 2425–94, and then 2537–672, BR adding 40000 to their numbers to make them 42425–94, and then 42537–672. The LMS classified them 4P, BR 4MT. They were the basis for the LMS Fairburn 2-6-4T.
See main article: article and Irk Valley Junction rail crash.
No 2429 had a starring role as Celia Johnson's branch line engine in the 1945 film Brief Encounter, which was made at Carnforth station during the winter of 1944–45. The BR numberplate (42429) was sold at a BR auction held in the old Refreshment Room at Southport Chapel Street station.
The first withdrawal was in 1960, with the last in 1967. None have been preserved (though the original of the 3-Cylinder 2-6-4T version, number 2500, is preserved at the National Railway Museum, and two examples of the nearly identical LMS Fairburn 2-6-4T are also still in existence).
| 1960 | 206 | 2 | align=left | 42450/90. |
| 1961 | 204 | 17 | align=left | 42427–28/38/67/71/75/79, 42539/45/49/52/70, 42627/35/37/48/69. |
| 1962 | 187 | 43 | align=left | 42429/33/43/48/52/54/57/70/72–73/76/83, 42537–38/40–41/44/53/68/75–76/78–80/85/91/93/96/99, 42600/15/21/24/38/41–42/46/53/58/61/66/71–72. |
| 1963 | 144 | 29 | align=left | 42425/40/58/66/69/80/85–87/91, 42543/47/56–57/61/63/71/82/92/95/98, 42603/17/32/36/43/55/59/68. |
| 1964 | 115 | 51 | align=left | 42434/37/41/44–46/49/51/53/61/63/74/81/89/93, 42550–51/59–60/62/65/69/72–73/84/86/88–89/94, 42602/05/07–08/12/14/19–20/23/28–31/33/39–40/51–52/54/57/62/70. |
| 1965 | 64 | 38 | align=left | 42426/30/32/35/39/42/47/56/59–60/64–65/68/77–78/82/85/92/94, 42542/54–55/58/64/66–67/90/97, 42601/04/09/18/26/34/45/49/60/67. |
| 1966 | 26 | 11 | align=left | 42431/36/55/62/84, 42581/83, 42606/10/25/64. |
| 1967 | 15 | 15 | align=left | 42546/48/74/77/87, 42611/13/16/22/44/47/50/56/63/65. |
In 2008, Hornby Model Railways released Stanier's 4MT as a OO gauge ready-to-run model.[2] Two versions were due to be released; one in LMS Black, the other in BR Black (early and late).
A pre-war O gauge model of this locomotive was produced by Marklin for Bassett-Lowke models in 1937; this continued in UK production by Winteringham until 1957. This model has been reproduced in O gauge by ACE Trains in 2009; both LMS and BR black versions have been manufactured.