GNRI Class BT

Great Northern Railway Class BT were a class of 13 4-4-0T tank locomotives introduced by the GNR(I) from 1887. They were the Great Northern Railways first home built engine and therefore the first engine to be built in Dundalk works.^[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 Builder Dundalk works Build date 1887 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particularly with bogie carriages a factor meant by the 1920s they were underpowered for all available work and were withdrawn by 1921.^[2]