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After some research, I found that one of the main reasons that single axle trucks bear a greater impact at rail joints than two axle trucks is the rail compression factor. As the wheel passes over a rail, it presses down on it, and as the joint is approached the next rail section will be slightly higher than the occupied rail, thus there is a THUMP when the joint is crossed over. One way to ameliorate this affect for single axle trucks is to use larger diameter wheels, which will "soften" the angle of the wheel/joint contact. The TTOX used 28" wheels, so if those were replaced with 38" wheels, this affect would be lessened. The question is if it would be enough to make a significant difference. <br /> <br />Dave
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