Editing LMS Princess Royal Class (section)

==Design==
The class was based on [[GWR 111 The Great Bear]], a design produced in 1907 for the Great Western by [[George Jackson Churchward]].<ref>{{harvnb|Tuplin|1969|page=106}}</ref> The smokebox and cylinders were closely based on those of the [[GWR 6000 Class]] (also known as the King Class).<ref name=Tuplin107>{{harvnb|Tuplin|1969|page=107}}</ref> The inside cylinders were abreast the leading bogied wheels and drove cranks on the leading coupled axle, the outside cylinders were abreast the rear bogie wheels (which made substantial cross-bracing necessary between the cylinders and the locomotive frame) and drove crank pins on the centre coupled axle.<ref>{{harvnb|Tuplin|1969|page=85}}</ref> Each of the four cylinders had its own set of Walschaerts valve gear.

Other minor details, such as corks to close oil boxes, closely followed Great Western practice.