Supposedly, there is a Swindon line diagram [weight drg] of the complete loco and a couple of boiler schemes.
Do you know where I might find any schemes sketches?
I particularly want to know the wheel base.
Great Bear had coupled wheels 7ft plus 7 ft axle pitch.
Princess was a near copy of the Bear [dimensionally]
Duchess had/has 7ft-3 plus 7ft-3 driver pitch.
Merchant Navy had/has 7ft-6 plus 7ft-6 drivers
It is said that MN boiler was favoured [280psi] and MN boiler has similar dimensions to King except MN has wide firebox.