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North Eastern classes Z and Z1
London & North Eastern class C7 and originally class V2
Great Britain | 1911 | 50 produced
Locomotive Magazine, November 1911

Vincent Craven designed the Atlantics of the class V2 in 1911 with a single expansion three-cylinder engine. He had ten saturated and ten superheated locomotives built, which had cylinders of different dimensions and were soon renamed the Z and Z1 classes. From 1914, thirty more were built in the superheated version, the first ten were rebuilt to the same variant and all renamed Class Z. Some locomotives were used to test feedwater heatersboosters and uniflow cylinders. At the LNER they became class C7. The last survivors came to British Railways in 1948, but were immediately retired.

VariantZZ1
General
Built19111911-1918
ManufacturerNorth British
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length64 ft 3 3/8 in
Wheelbase29 ft 6 in
Fixed wheelbase7 ft 7 in
Service weight171,808 lbs172,480 lbs
Adhesive weight88,704 lbs98,560 lbs
Total weight272,608 lbs273,952 lbs
Axle load44,464 lbs44,800 lbs
Water capacity495 us gal4,954 us gal
Fuel capacity12,320 lbs (coal)
Power
Power sourcesteam
Estimated power1,050 hp (783 kW)
Optimal speed37 mph35 mph
Starting effort18,162 lbf19,261 lbf
Power Plant
Driver diameter82 in
Boiler pressure187 psi175 psi
Expansion typesimple
Cylindersthree, 15 1/2 x 26 inthree, 16 1/2 x 26 in
Boiler
Grate area27 sq ft
Firebox area180 sq ft185 sq ft
Tube heating area2,160 sq ft1,298 sq ft
Evaporative heating area2,340 sq ft1,483 sq ft
Superheater area392 sq ft
Total heating area2,340 sq ft1,875 sq ft
Calculated Values
steam locomotive
express
Vincent Litchfield Raven
last changed: 03/2023
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