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IOTL, the government considered nationalizing the railways after the Great War before Grouping was settled upon. It appears it got far enough that standard engines were being considered, or at least Maunsell's N class mixed-traffic engines were considered for one. 100 were ordered from Woolwich Arsenal to stimulate the post-war local economy, but could it also have been a carry over from preparation for nationalization in some way?
Supposing Britain's railways are nationalized in 1923, what happens to the railways from here onwards? If Maunsell is chosen to be the CME, how will mould Britain's engine design?