 There were also plans for streamlining all the members of the new A1 class, but these were never acted upon.In October 1945, the order was given to construct sixteen new locomotives to the new A1 plan.However, before these could be built Thompson had retired and Arthur Peppercorn had taken over as CME and he deferred building them until 1948, by which time he had altered the design to become the Peppercorn Class A1 Pacific design.