You can see that the fly cranks and coupling rods are fitted, and all the bits of the valve gear are ready to be assembled.
Each of these power bogies really are a work of art in their own right.
The thing that really stands out is how huge those cylinders are for a 2ft gauge locomotive - could you imagine that scaled up on a standard gauge machine with the same diameter of wheels!
It's also worth noting that the chassis is driven off the front axle - which makes sense when you think about where the tanks sit on an NGG/16 - and all the drive goes through the motion.
This is proper miniature engineering.
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