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When building cars and locomotives (not diesels), I always put extra effort in checking the free rolling capabilities of the trucks and mechanisms. If I find binding in the mechanisms or the trucks do not roll as well as others I've checked, I re-work until they do. Beyond this, I don't know what else can really be done. I think metal wheels are helpful. They don't spread dirt and they roll better. Matching axle length to bearing surfaces in the trucks is important. Shorter axles then needed is worse than too long. The axles should meet the bearings on their points. Because the wheel treads are conical, some of the function you mention is met. However, I would guess it is far more important to make the trucks as free rolling as possible.
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