Bulleid Firth Brown wheel
…BFB was developed in 1938 for use on Bulleid's innovative Merchant Navy class of Pacific locomotives. He later used them on all subsequent designs: the Q1 "austerity class" in 1942; his Light Pacifics (the West Country and Battle of Britain classes) in 1945; and his Leader class in 1946. The pacifics also used a similar…