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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 |
London and North Western Railway |
Big Four |
London, Midland & Scottish Railway |
Wheels |
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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