LNER Peppercorn Class A1

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8 in (2.032 m)
Trailing dia.	3 ft 8 in (1.118 m)
Length	72 ft 11+3⁄4 in (22.24 m)
Width	9 ft 2+7⁄8 in (2.82 m)
Height	13 ft 1 in (3.99 m)
Axle load	22.1 long tons (22.5 t; 24.8 short tons)
Adhesive weight	66.55 long tons (67.62 t; 74.54 short tons)
Loco weight	105.2 long tons (106.9 t; 117.8 short tons)
Tender weight	60.9 long tons (61.9 t; 68.2 short tons)
Total weight	166.1 long tons (168.8 t; 186.0 short tons)
Fuel type	Coal
Fuel capacity	9 long tons (9.1 t; 10 short tons)
Water cap.	5,000 imp gal (23,000 L; 6,000 US gal)
Firebox:
• Grate area	50.0 sq ft (4.65 m2)
Boiler	Diagram 118 ; 6 ft 5 in (1.96 m) diameter ; 29 ft 2 in (8.89 m) length
Boiler pressure	250 psi (1,700 kPa)
Heating surface:
• Firebox	245.3 sq ft (22.79 m2)
• Tubes	1,211.6 sq ft (112.56 m2)
• Flues	1,004.5 sq ft (93.32 m2)
• Total surface	2,461.4 sq ft (228.67 m2)
Superheater:;
• Heating area	697.7 sq ft (64.82 m2)
Cylinders	3
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Valve gear	Walschaerts

Type and origin
Type and origin
Power type	Steam
Designer	Arthur Peppercorn
Builder	Doncaster Works ; Darlington Works
Build date	1948–1949, 2008
Total produced	49

LNER Peppercorn Class A1
LNER Peppercorn Class A1
	An A1 Class locomotive at Kings Cross "Top Shed", circa May 1963
Power type
Type and origin
Power type	Steam
Designer	Arthur Peppercorn
Builder	Doncaster Works ; Darlington Works
Build date	1948–1949, 2008
Total produced	49
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8 in (2.032 m)
Trailing dia.	3 ft 8 in (1.118 m)
Length	72 ft 11+3⁄4 in (22.24 m)
Width	9 ft 2+7⁄8 in (2.82 m)
Height	13 ft 1 in (3.99 m)
Axle load	22.1 long tons (22.5 t; 24.8 short tons)
Adhesive weight	66.55 long tons (67.62 t; 74.54 short tons)
Loco weight	105.2 long tons (106.9 t; 117.8 short tons)
Tender weight	60.9 long tons (61.9 t; 68.2 short tons)
Total weight	166.1 long tons (168.8 t; 186.0 short tons)
Fuel type	Coal
Fuel capacity	9 long tons (9.1 t; 10 short tons)
Water cap.	5,000 imp gal (23,000 L; 6,000 US gal)
Firebox:
• Grate area	50.0 sq ft (4.65 m2)
Boiler	Diagram 118 ; 6 ft 5 in (1.96 m) diameter ; 29 ft 2 in (8.89 m) length
Boiler pressure	250 psi (1,700 kPa)
Heating surface:
• Firebox	245.3 sq ft (22.79 m2)
• Tubes	1,211.6 sq ft (112.56 m2)
• Flues	1,004.5 sq ft (93.32 m2)
• Total surface	2,461.4 sq ft (228.67 m2)
Superheater:;
• Heating area	697.7 sq ft (64.82 m2)
Cylinders	3
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Valve gear	Walschaerts
Maximum speed
Performance figures
Maximum speed	100 mph (160 km/h)
Power output	2,700 hp (2,000 kW)
Tractive effort	37,400 lbf (166 kN)
Operators
Career
Operators	British Railways
Power class	BR: 8P6F
Number in class	49 original, 1 completed in 2008
Numbers	60114–60162, 60163
Locale	North Eastern Region
First run	August 1948
Last run	June 1966
Withdrawn	October 1962–June 1966
Disposition	Original 49 withdrawn and scrapped, 1 built in 2008 and Mainline Registered

London and North Eastern Railway's (LNER) Peppercorn Class A1 is a class of 4-6-2 "Pacific" steam locomotives built between 1948 and 1949 at Doncaster and Darlington Works to a design of Arthur Peppercorn. Forty-nine were built for hauling express passenger services on the East Coast Main Line owned by LNER's successor, British Railways' North Eastern Region. None of the original 49 Peppercorn A1s survived into preservation, with the last being scrapped in 1966. The 50th Peppercorn A1, 60163 Tornado, was completed in 2008 as an evolved member of its class.

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