1927 the cab roofs were extended at the back.
Snifting valves: position
spectacle windows: plated
over during the late 1920s.
ATC equipment: fitted
to the entire class in 1930/1.
Smokebox chin step: two different designs.
bracket: moved to smokebox door in 1934-37.
Vacuum pipe: originally tall - later a shorter pattern introduced.
truck spring housing: originally uncovered but subsequently fitted with a bell