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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

Manufacturers

Manufacturer	Total
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

BRDatabase

Complete BR Locomotive Database 1948-1997

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LNWR/LMS Webb "Improved Precedent" Class 2-4-0 - 'Jumbo'