LMS Patriot Class 5551 The Unknown Warrior

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LMS Patriot Class 5551 The Unknown Warrior
An almost complete looking 5551 inside the shed at Crewe Heritage Centre, on this day it was to have its new crest unveiled.
Type and origin Power type Steam Designer Sir Henry Fowler (original designer) Builder Original - LMS Crewe Works, Rebuild- The LMS Patriot Project Build date Original - May 1934, Rebuild - 2008–present
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 3 in (0.991 m) Driver dia. 6 ft 9 in (2.06 m) Length 62 ft 8+3⁄4 in (19.120 m) Loco weight 80.75 long tons (82.05 t; 90.44 short tons) Tender weight 42.70 long tons (43.39 t; 47.82 short tons) Total weight 123.45 long tons (125.43 t; 138.26 short tons) Fuel type Coal Fuel capacity 5.5 long tons (5.6 t; 6.2 short tons) Water cap. 3,900 imp gal (18,000 L; 4,700 US gal) Firebox: ​  • Grate area 30+1⁄2 sq ft (2.83 m2) Boiler G9½S Boiler pressure 200 psi (1.4 MPa) Heating surface: ​  • Firebox 183 sq ft (17.0 m2)  • Tubes and flues 1,552 sq ft (144.2 m2) Superheater: ​  • Heating area 365 sq ft (33.9 m2) Cylinders 3 Cylinder size 18 in × 26 in (457 mm × 660 mm) Valve gear Walschaerts Valve type Piston valves Train brakes Vacuum (primary), Air
Performance figures Tractive effort 26,520 lbf (118.0 kN)
Career Class Patriot Class Numbers 5551 (LMS Colours) 45551 (BR Colours) 98651 (TOPS) Official name The Unknown Warrior First run Original - May 1934, Replica - Retired June 1962 Disposition Original locomotive scrapped, rebuilt under construction

No.5551 The Unknown Warrior is a replica LMS Patriot Class steam locomotive which is under construction at Tyseley Locomotive Works.

The locomotive is a replica of the final 'Patriot' class locomotive to be built, No.5551. The original locomotive was built in May 1934, and withdrawn in June 1962 (it was scrapped that October). Unlike the original engine, which never received a name, the new one will be named "The Unknown Warrior"; the name was chosen by public poll.

All of the original un-rebuilt LMS Patriot Class locomotives were withdrawn by November 1962 and the whole class was withdrawn by December 1965 with none of the engines (un-rebuilt or rebuilt) surviving into preservation.