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[quote]QUOTE: Originally posted by Old Timer Murphy Siding - the four-wheel trailer was necessary to carry the weight of the larger firebox. [/quote] This brings to mind a question left unanswered on the T1 thread. Remember the 4-6-0 locomotives? They had a "gap" between the second and third set of drivers to support the firebox. I have assumed that since larger fireboxes required more width than could be afforded between 4' 8.5" gauge, they had to abandon the idea of supporting the firebox with the drivers and relegate that requirement to a supporting truck under the firebox. The question I had is this: Why couldn't the drivers support a wider firebox by extending outward the connecting rods between the driving axle in front of the firebox and the driving axle behind the firebox? That way you have more weight being supported by the drivers (e.g. more traction) instead of a non-driving trailing truck, while still maintaining the advantage of the larger firebox.
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