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MR/LMS Johnson "1738" Class 4-4-0

General

Designer

Samuel Johnson

Introduced

1885

Pre-Grouping Company

Midland Railway

Grouping Company

London, Midland & Scottish Railway

Wheel Arrangement

4-4-0

Number Built as 1738

Conversions to other classes

First in Service

1885

Last in Service

12/1956

Manufacturers

Manufacturer	Total
Derby Works	20

Orders

Builder	Sponsor	Order #	Date	Size
Derby Works		554	1885	10
Derby Works		815	1886	10

**Power**
Variant Introduced	1885
Inside Cylinders	18" x 26" (2 off)

**Wheels**
Pony	3' 6"
Drivers	7' 0¹⁄₂"
Locomotive Wheelbase	21' 6¹⁄₂"
Descriptive Wheelbase	6' 0" + 7' 0½" + 8' 6" = 21' 6½" (engine only)

**Dimensions**
Weight (loco only)	43t 0cwt

**Boiler & Firebox**
Boiler Diagram	B(b)
Boiler Max Diameter	4' 1"
Boiler Barrel Length	10' 6"
Boiler Pressure	160lbs
Firebox Type	Round Top
Firebox Length	5' 11"
Firebox Grate Area	17.5ft²
Firebox Heating Surface	110ft²
Tube Number	223
Tube Diameter	1³⁄₄"
Tube Area	1123ft²
Total Evaporative Area	1233ft²
Total Heating Area	1233ft²

Complete BR Locomotive Database 1948-1997

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MR/LMS Johnson "1738" Class 4-4-0