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Record: 71951 (21/04/2026)
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SR Bulleid "WCBB" Class 4-6-2
Class Types
| SR Class |
WCBB |
General
| Designer |
Oliver Bulleid |
| Introduced |
1945 |
| Grouping Company |
Southern Railway |
| Wheel Arrangement |
4-6-2 |
| Number Built as WCBB |
110 |
| First in Service |
06/1945 |
| Last in Service |
07/1967 |
| Manufacturers |
|
|
|
|
Power
|
Original Casing |
Rebuilds |
| Variant Introduced |
1945 |
1957 |
| Tractive Effort |
31,000lbs |
27,720lbs |
| Inside Cylinders |
16.375" x 24" (1 off) |
16.375" x 24" (1 off) |
| Inside Valves |
10"Piston |
? |
| Inside Motion |
Bulleid Chain |
Walschaerts |
| Outside Cylinders |
16.375" x 24" (2 off) |
16.375" x 24" (2 off) |
| Outside Valves |
10"Piston |
? |
| Outside Motion |
Bulleid Chain |
Walschaerts |
Wheels
|
Original Casing |
Rebuilds |
| Pony |
3' 1" |
As Original Casing |
| Drivers |
6' 2" |
As Original Casing |
| Truck |
3' 1" |
As Original Casing |
| Locomotive Wheelbase |
35' 6" |
As Original Casing |
| Descriptive Wheelbase |
6' 3" + 5' 6" + 7' 6" + 7' 3" + 9' 0" = 35' 6" (engine only) |
As Original Casing |
Dimensions
|
Original Casing |
Rebuilds |
| Length (over buffers) |
67' 43⁄4" |
As Original Casing |
| Weight (in running order) |
128t 12cwt |
134t 8cwt |
| Weight (loco only) |
86t 0cwt |
91t 16cwt |
| Adhesive Weight |
56t 5cwt |
As Original Casing |
| Maximum Axle Load |
18t 15cwt |
As Original Casing |
| Water Capacity |
4,500gal |
As Original Casing |
| Coal Capacity |
5t 0cwt |
As Original Casing |
Boiler & Firebox
|
Original Casing |
Rebuilds |
| Boiler Max Diameter |
6' 31⁄2" |
As Original Casing |
| Boiler Min Diameter - tapered boiler |
5' 93⁄4" |
As Original Casing |
| Boiler Barrel Length |
16' 91⁄2" |
As Original Casing |
| Boiler Pressure |
280lbs |
As Original Casing |
| Firebox Type |
Belpaire |
As Original Casing |
| Firebox Length |
6' 11" |
As Original Casing |
| Firebox Grate Area |
38.75ft2 |
As Original Casing |
| Firebox Heating Surface |
253ft2 |
As Original Casing |
| Tube Number |
112 |
As Original Casing |
| Tube Diameter |
21⁄4" |
As Original Casing |
| Tube Area |
1121ft2 |
As Original Casing |
| Flue Elements |
32 |
As Original Casing |
| Flue Diameter |
51⁄4" |
As Original Casing |
| Flue Area |
748ft2 |
As Original Casing |
| Total Evaporative Area |
2122ft2 |
As Original Casing |
| Superheater Element Area |
545ft2 |
As Original Casing |
| Total Heating Area |
2667ft2 |
As Original Casing |
|
