GNRI Class PG

Great Northern Railway Classes PG, QG, QLG and QNG[lower-alpha 1] were a series of 0-6-0 freight locomotives introduced from 1899 by Charles Clifford.[1]

Great Northern Railway
Classes PG, QG, QLG and QNG
Type and origin
Power typeSteam
DesignerC. Clifford
Serial number
  • 10,11,100−103,151 (PG)
  • 152-155 (QG)
  • 119, 158-165 (QLG)
  • 38, 39, 112 (GNQ)
Build date1899—1911
Total produced28
Specifications
Configuration:
​
 • Whyte0-6-0
Gauge5 ft 3 in (1,600 mm)
Driver dia.4 ft 7+1⁄4 in (1,403 mm)
Loco weight39 long tons 14 cwt (88,900 lb or 40.3 t)—49 long tons 0 cwt (109,800 lb or 49.8 t)
Boiler pressure175 lbf/in2 (1,206.58 kPa)
CylindersTwo, inside
Train heatingsteam
Performance figures
Tractive effort19,880 lbf (88.43 kN)−24,065 lbf (107.05 kN)
Career
OperatorsGNR(I) → UTA → CIÉ
Number in class28
[1]

History

The PG class was introduced in December 1899 by Charles Clifford with 4 feet 7 inches (1.40 m) driving wheels and 18+1⁄2 by 24 inches (47 cm × 61 cm) cylinders.[2] The QG's introduced in 1904 were 1 foot 6 inches (0.46 m) longer than the PG with 18+1⁄2 by 26 inches (47 cm × 66 cm) cylinders weighed in 2 tons heavier.[3] The key changed with the QLG class introduced in 1906 was a 4 feet 9 inches (1.45 m) wide boiler.[4]

Notes
  1. There are variations in the class designations, sometimes LQG is used for QLG for example

References
  1. Boocock (2009), pp. 73−75.
  2. Johnston (1999), pp. 81–82.
  3. Johnston (1999), p. 83.
  4. Johnston (1999), pp. 83–84.
  • Boocock, Colin (1 October 2009). "Locomotive Compendium Ireland" (1st ed.). Ian Allan. ISBN 9780711033603.
  • Johnston, Norman (1999). Locomotives of the GNRI. Newtownards: Colourprint Books. ISBN 1-898392-48-X. OCLC 43340833. OL 12248170M.
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