[Mr. Lucky]

Probably no flange on the middle set of wheels.

[mrreaganaut]

“Probably no flange on the middle set of wheels.”
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That’s only true on toy trains, not full-size engines.

Railroads know what their radii are, and have worked for 150 years to make them larger, in order to accommodate larger motive power. The ‘Pacific’ three-driver-per-side configuration on this ‘large’ British engine was actually the most common for ordinary American engines in the 20th century (the ‘American’ two-driver was the most common in the 19th c., and perhaps is better known today from the movies.)

Articulated engines had two sets of drivers, mounted on pivots, to provide necessary power on roads where the terrain precluded regrading to larger radii. Modern diesels are also articulated.

[GonzoGOP]

Probably no flange on the middle set of wheels.

All drivers are flanged. A 4-6-2 isn't going to have any problems with curves, but with that much horsepower on only three drivers (especially ones that big), that thing is going to slip like crazy. The engineer (driver in the UK) is going to have to have a light hand with that one.

Cool thing is she is a three cylinder design (unlike the vast majority of US locomotives that had only 2) The third cylinder is between the frames. I hope it has automatic greasers for the bearings or the poor fireman gets to crawl in the snow.