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BR Standard Riddles "Standard Class 3" Class 2-6-0


General
Designer Riddles
Introduced 1954
Description (1957) 'Class 3' 2-6-0's, with 5' 3" driving wheels and 2 outside cylinders 17½" x 26". This class consists of 20 engines only, built in 1954. An order for a further five of this class was cancelled.
Wheels 2-6-0
Number Built as BR3/1 20
Number Scrapped 20
Number Preserved 0
First in Service 09/02/1954
Last in Service 09/07/1967
Manufacturers
ManufacturerTotal
Swindon Works 20
Historical Data The parent office for design was Swindon, but certain details were undertaken at Brighton, Derby and Doncaster. Like the tank version, the tender type had almost universal availability over main and secondary lines throughout Britain and was designed to replace various tender engines of similar power classification.
The boiler, which is the same as that used on the tank version, follows closely the design of the former GWR boiler used on the 5100, 8100 and 5600 classes.

Illustration
Copyright: RicsRailPics
Power
Variant Introduced 1954
Tractive Effort 21,490lbs
Outside Cylinders 17.5" x 26" (2 off)
Outside Valves Piston
Outside Motion Walschaerts

Wheels
Pony 3'
Drivers 5' 3"
Locomotive Wheelbase 24' 1"
Tender Wheelbase 11'
Total Wheelbase 46' 1134"
Descriptive Wheelbase 8' 9" + 7' 7" + 7' 9" + 9' 10¾" + 6' 6" + 6' 6"
= 46' 11¾"

Dimensions
Length (over buffers) 55' 1114"
Weight (loco only) 57t 9cwt
Adhesive Weight 48t 10cwt
Maximum Axle Load 16t 5cwt
Water Capacity 3,500gal
Coal Capacity 6t 0cwt

Boiler & Firebox
Boiler Diagram BR6
Boiler Pressure 200lbs
Firebox Grate Area 20.35ft2
Firebox Heating Surface 118.42ft2
Total Evaporative Area 923.54ft2
Superheater Element Area 184.5ft2
Total Heating Area 1108.04ft2