| LNWR Experiment Class |
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| Type and origin |
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| Power type | Steam |
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| Designer | George Whale |
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| Builder | Crewe Works |
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| Serial number | 4505–09, 4550–59, 4620–39, 4680–89, 4770–89, 4830–69 |
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| Build date | 1905–1910 |
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| Total produced | 105 |
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| Rebuild date | 1915 |
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| Number rebuilt | 1 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-0 |
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| • UIC | 2′C n2 (rebuilt: 2′C n4) |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 3 ft 9 in (1.143 m) |
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| Driver dia. | 6 ft 3 in (1.905 m) |
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| Loco weight | 65.75 long tons (66.81 t) |
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| Fuel type | Coal |
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| Boiler pressure | 175 psi (1.21 MPa) |
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| Heating surface | 2,041 sq ft (189.6 m2) |
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| Cylinders | Two (rebuilt: four) |
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| Cylinder size | 19 in × 26 in (483 mm × 660 mm);
rebuilt: 14 in × 26 in (356 mm × 660 mm) |
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| Valve gear | Joy; rebuilt: Dendy-Marshall |
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| Valve type | Slide valves |
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| Performance figures |
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| Tractive effort | 18,616 lbf (82.8 kN); rebuilt: 20,232 lbf (90.0 kN) |
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The London and North Western Railway (LNWR) Experiment Class was a class of 4-6-0 steam locomotive designed by George Whale.
