The last two cranes (number 6a and SB4) were built by Ransomes & Rapier of Ipswich in 1913 and 1919. With a lifting capacity of both were employed on railway work until the 1960s. During LNER days SB4 was frequently used at publicity events to give people an aerial ride in an old wagon body. While 6a was transferred away from the GER shortly after 1923, SB4 was allocated to Stratford, Norwich and March before moving north to the Sheffield area.