Great Northern Railway Class BT were a class of 13 4-4-0T tank locomotives introduced by the GNR(I) from 1885.[1]

Great Northern Railway Class BT
BT No. 1 at Irish Street Halt, Armagh, 1909
Type and origin Power type Steam Designer J.C. Park Build date 1885 Total produced 13
Specifications Configuration: ​  • Whyte 4-4-0T Gauge 5 ft 3 in (1,600 mm) Driver dia. 4 ft 7 in (1,397 mm) Boiler pressure 160 lbf/in2 (1,103.16 kPa) Cylinders Two, inside Cylinder size 15 in × 20 in (380 mm × 510 mm) Train heating steam
Career Operators GNR(I) Number in class 13

While fit for purpose when built, increasing train weights particularly with bogie carriages a factor meant by the 1920s they were underpowered for all available work and were withdrawn by 1921.[2]

References

• Johnston, Norman (1999). Locomotives of the GNRI. Newtownards: Colourprint Books. ISBN 1-898392-48-X. OCLC 43340833.
• Rowledge, Peter (1993). Irish Steam Loco Register. Stockport, England: Irish Traction Group. ISBN 9780947773335. OCLC 30815253.

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