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Lancashire & Yorkshire class 7 “High-Flyers”
Great Britain | 1899 | 40 produced
flickr/Historical Railway Images

Also known as “High-Flyers”, the Lancashire & Yorkshire class 7 locomotives were among the first Atlantics in Britain. Their nickname came from the high-pitched boiler that lay above the 7 ft 3 in high driving wheels. Aspinall had developed them to get a more powerful replacement for the existing 4-4-0 and 4-2-2 locomotives. As with Ivatt, this wheel arrangement was chosen to accommodate a larger, albeit narrow, firebox

At the time of their introduction, they had the largest boiler of any British steam locomotive and reached high average speeds with the relatively light trains. While No. 1417's alleged speed of 117 mph is highly questionable, No. 1392 likely actually reached 100 mph with a five-car train on a trial run in 1899.

After one of the locos was the first in Britain to be fitted with an early superheater, five others were also fitted with it, but this was later removed. After the grouping, they were the only 4-4-2 tender locomotives on the LMS and were grouped into power class 2P. The withdrawals took place between 1926 and 1934.

General
Built1899-1902
ManufacturerHorwich
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase27 ft 9 in
Fixed wheelbase7 ft 3 1/2 in
Service weight131,600 lbs
Adhesive weight78,400 lbs
Total weight200,284 lbs
Axle load39,200 lbs
Water capacity3,303 us gal
Fuel capacity11,760 lbs (coal)
Power
Power sourcesteam
Estimated power950 hp (708 kW)
Optimal speed37 mph
Starting effort16,506 lbf
Power Plant
Driver diameter87 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 19 x 26 in
Boiler
Grate area26.1 sq ft
Firebox area175.8 sq ft
Tube heating area1,877.2 sq ft
Evaporative heating area2,053 sq ft
Total heating area2,053 sq ft
Calculated Values
steam locomotive
express
John Aspinall
last changed: 08/2023
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