GNRI Class BT
Great Northern Railway Class BT were a class of 13 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.
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particularly with bogie carriages a factor meant by the 1920s they were underpowered for all available work and were withdrawn by 1921.