Peckett OQ Class

Specifications
Specifications
Configuration:;
• Whyte	0-6-0ST
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	4 ft 0+1⁄2 in (1.232 m)
Loco weight	55 tons
Fuel type	Coal
Firebox:
• Grate area	19.1 sq ft (1.77 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface	921 sq ft (85.6 m2)
Cylinders	Two, outside
Cylinder size	18 in × 26 in (457 mm × 660 mm)

Type and origin
Type and origin
Power type	Steam
Builder	Peckett & Sons
Serial number	2124, 2150–2151
Model	OQ
Build date	1951–1954
Total produced	3

Peckett OQ Class
Peckett OQ Class
	Peckett OQ Class 0-6-0ST No. 2150 Mardy Monster at the Elsecar Heritage Railway
Power type
Type and origin
Power type	Steam
Builder	Peckett & Sons
Serial number	2124, 2150–2151
Model	OQ
Build date	1951–1954
Total produced	3
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-0ST
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	4 ft 0+1⁄2 in (1.232 m)
Loco weight	55 tons
Fuel type	Coal
Firebox:
• Grate area	19.1 sq ft (1.77 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface	921 sq ft (85.6 m2)
Cylinders	Two, outside
Cylinder size	18 in × 26 in (457 mm × 660 mm)
Tractive effort
Performance figures
Tractive effort	29,527 lbf (131.34 kN)
Operators
Career
Operators	Mardy Colliery; Tower Colliery;
Disposition	2 scrapped, 1 preserved

The Peckett OQ Class is a class of 0-6-0 ST steam locomotives built in Bristol, England by Peckett & Sons. Three were built; no. 2124 for Tower Colliery in 1951 and nos. 2150 and 2151 for Mardy Colliery in 1954. No. 2150 has been preserved and is named Mardy Monster. According to Heritage Railway magazine it is "Britain’s most powerful industrial locomotive". This claim may be misleading because it is based on tractive effort rather than horsepower.