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The reference for locomotives and railcars

Great Central class 9P “Lord Faringdon”

London & North Eastern class B3

Great Britain 1917 6 produced
No. 1165 “Valour” collection Taylor Rush

Robinson developed two 4-6-0 locomotives for the GCR during the First World War, which were the class 9P shown here for express service and class 9Q for mixed service. They received the same boiler that had already been used in classes 1 and 1A. Of the 9P, only No. 1169 “Lord Faringdon” was built in 1917, which also gave the class its name. It wasn't until 1920 that five more followed.

They had four cylinders in one plane. The inner ones had their own Stephenson valve gear and drove the first driving axle. The outer cylinders were controlled by the inner ones via rocker shafts and drove the second driving axle. However, this led to complicated steam paths, poor steam flow and leaks, which was to be changed by Gresley after the LNER took them over.

Four of the class, now known as B3, were rebuilt to B3/2 with Caprotti valve gear in 1929, 1938 and 1939, while those that were not rebuilt became B3/1. A B3/3 followed in 1943, which had been rebuilt into a two-cylinder. Regardless of the modifications, all were withdrawn between 1947 and 1949.

Technical data

General

Built
1917, 1920
Manufacturers
Gorton
Wheel arrangement
4-6-0 (Ten-wheeler)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
19.22 m
Wheelbase
8.79 m
Total wheelbase
16.09 m
Service mass
79.2 t
Adhesion mass
58.1 t
Rigid wheelbase
4.72 m
Axle load
20.3 t
Water capacity
18,185 l
Fuel capacity
6.1 t (coal)

Boiler

Grate area
2.415 m²
Firebox surface
15.143 m²
Tube heating surface
174.751 m²
Evaporative heating surface
189.894 m²
Superheater surface
31.866 m²
Total heating surface
221.8 m²

Power plant

Driver diameter
2,057 mm
Boiler pressure
12.4 bar
Expansion type
simple expansion
Cylinders
four, 406 x 660 mm

Power

Power source
steam
Estimated power
1,007 kW (1,369 PS)
Starting effort
111.9 kN

Calculated values

Factor of adhesion
1 : 5.09
Optimal speed
55 km/h
Power-to-weight ratio
12.7 kW/t
Heating Surface Equivalent
329.3 m²
Cylinder volume/HSE
1 : 1,040.44
Adhesive weight/Total
1 : 1.36
Tractive force/Heating surface
1 : 10.53
Grate area/Heating surface
1 : 91.83
Firebox/Tube surface
1 : 11.54
Total/Superheater
1 : 5.96
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