Editing LMS Princess Royal Class (section)

=== Later production ===
A second batch of eleven locomotives was constructed later.<ref name="Rowledge, 1935 batch" >{{Cite book
  |title=The LMS Pacifics
  |last=Rowledge  |first=J.W.P. 
  |year=1987
  |publisher=[[David & Charles]]
  |isbn=0-7153-8776-6
  |chapter=5: The Princess Royal Class – Modifications, and the 1935 Batch
  |pages=44–51
}}</ref> The first two locomotives of the class to be produced had a firebox combustion volume too small for the grate area, and the subsequent locomotives had enlarged fireboxes.<ref name=Tuplin107/>