Gresley’s A3sGresleys A3s RRP is 25. 00 OUR PRICE 19. 95 Nigel Gresley built his first Pacific class of locomotives to deal with increasing demands from passenger traffic. Some Pacifics started as Class A1s but were eventually rebuilt to Class A3 specifications. Others were built as A3s from the outset. Suffice to say the A3s underwent a number of significant alterations during their lifetime extending from 1922 to the mid 1960s. Gresleys A3s documents every