R30406 LNER Streamlined B17 City of London No.2870 Steam LocomotiveGresley developed a three cylinder 4 6 0 to cope with increased loadings on the LNERs East Anglian passenger services in the shape of the B17 Class, as he could not use his famous Pacifics due to weight constraints. Two of the class were given A4 style streamlining in September 1937 for publicity purposes, including No. 2870 Tottenham Hotspur, which was then renamed City of London. They were designated B17 5s, but the streamlining was removed in April