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Record: 71951 (21/04/2026)
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LNWR/LMS Webb "Improved Precedent" Class 2-4-0 - 'Jumbo'
Class Types
| LNWR Class |
Improved Precedent |
| LNWR Class |
Renewed Precedent |
| (Also known as) |
Jumbo |
General
| Designer |
Francis Webb |
| Introduced |
1893 |
| Pre-Grouping Company |
London and North Western Railway |
| Grouping Company |
London, Midland & Scottish Railway |
| Wheel Arrangement |
2-4-0 |
| Conversions from other classes |
8 |
| Manufacturers |
|
| Historical Data |
Renewals of various classes (Webb Precedents, Webb Newtons and Ramsbottom Newtons plus a handful of rebuilt Precedents.
The term 'Renewal' is more of an accounting term and in reality, very little, if any, of the renewed locomotive was carried over to the new locomotive. For this reason, the renewals are being treated as new locomotives on BRDatabase, despite oftn carrying the same name and number as it's predecessor. |
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Power
| Variant Introduced |
1887 |
| Miscellaneous Differences |
Renewals or rebuilds of earlier engines - new steel boilers, new frames (1"), thicker tyres, circular smokebox door and different handrails. Steam braked. |
| Inside Cylinders |
17" x 24" (2 off) |
| Inside Motion |
Allan |
Wheels
| Pony |
3' 6" |
| Drivers |
6' 6" |
| Locomotive Wheelbase |
15' 8" |
| Descriptive Wheelbase |
7' 5" + 8' 3" = 15' 8" (engine only) |
Dimensions
| Weight (loco only) |
36t 0cwt |
Boiler & Firebox
| Boiler Diagram |
Imp Precedent |
| Boiler Max Diameter |
4' 2" |
| Boiler Barrel Length |
9' 10" |
| Total Heating Area |
1063.7ft2 |
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