Peckett OQ Class

The Peckett OQ Class is a class of 0-6-0ST steam locomotives built in Bristol, England, by Peckett and Sons. Three locomotives 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.[1] [2][3]

Peckett OQ Class
Peckett OQ Class 0-6-0ST No. 2150 Mardy Monster at the Elsecar Heritage Railway
Type and origin
Power typeSteam
BuilderPeckett and Sons
Serial number2124, 2150–2151
ModelOQ
Build date1951–1954
Total produced3
Specifications
Configuration:
​
 • Whyte0-6-0ST
Gauge4 ft 8 1⁄2 in (1,435 mm)
Driver dia.4 ft 0 1⁄2 in (1.232 m)
Loco weight55 tons
Fuel typeCoal
Firebox:
 • Firegrate area		19.1 sq ft (1.77 m2)
Boiler pressure200 psi (1.38 MPa)
Heating surface921 sq ft (85.6 m2)
CylindersTwo, outside
Cylinder size18 in × 26 in (457 mm × 660 mm)
Performance figures
Tractive effort29,527 lbf (131.34 kN)
Career
Operators
DispositionTwo scrapped, one preserved

Preservation

No. 2150 was withdrawn in 1976. Its preservation history is as follows:[4]

  • 1979, moved to the Swanage Railway but not used there
  • 1990s, moved to Elsecar Heritage Railway and restoration began
  • 2003, restoration completed and engine returned to service
  • 2015, overhaul in progress (boiler certificate expired)

The locomotive has also spent short periods on hire to other railways.

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References
  1. "The Monster returns - Heritage Railway Magazine". Heritagerailway.co.uk. Archived from the original on 4 March 2016. Retrieved 17 February 2016.
  2. "Peckett". Industrial Railway Society. Retrieved 23 December 2010.
  3. "Peckett Loco's". Martyn Bane. Retrieved 23 December 2010.
  4. "Elsecar Heritage Railway - Mardy Monster". Elsecarrailway.co.uk. 22 June 2003. Retrieved 17 February 2016.
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