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The side rods are(were) connected on the outside and next to the driving wheels (which are 4' 8 1/2" apart widthwise, give or take material dimensions), so the rods on opposite sides of each other are(were) about 5 - 5 1/2'(?) apart in width. The larger fireboxes were made to maximize the allowable width of a locomotive 10', maybe 10 1/2' wide. So you couldn't have the typical side rods compatable with the wider fireboxes as was done with the 4-6-0 locomotives. But if you could somehow extend outward the connection between the rod and driver wheel by a foot or so, you could conceivably fit a firebox with a 9' or so width between such outwardly extended rods between a front set of drivers and a rear set, and support this firebox between such driver wheels. I do not know if this is technecally feasable, but I see no reason why it wouldn't work as intended.
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