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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
ManufacturerTotal
Crewe Works 166
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.

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