The MR penchant for rebuilding locomotives and also recycling old numbers can be frustrating for enthusiasts! Another Kirtley class which had been rebuilt in various forms merits the following description by C. Hamilton Lewis (The Midland Railway, 1953): "How much an engine qualifies for definition as a "rebuild" when it has had new frames, new cylinders, new wheels and several new boilers at one time and another (and incidentally six different numbers) is something the present author hesitates to explain, but somehow it was all in the Midland tradition of locomotive longevity"
This is actually the 400-year-old-hammer-issue: the museum has a 400-year-old hammer on display, but 10 times new handle and 10 times new head.
In the text above, I like the section, where it says
... sandwich frames with tiebars between the horns. Not sure, if the drivers of 6 ft 6 in diameter do fit to the picture. I was more thinking of 6 ft by estimating it with the height of the side buffers, which are normally 1050 mm above TOR.
While browsing the net, I found locomotives from Craven, who worked for the London, Brighton and South Coast Railway, which show bracing of the frame in a similar as the Nr. 28. Craven was Kirtley's successor at Brighton.

Craven Nr. 153 built 1862.
The rod between the headstock and the first horn was not there on an earlier version built in 1852, but the bracing in front of the driver was already there.
