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Big boxes of air made of heavy steel plates, which is why Pullman and others put three axle trucks under them for better ride and lower axle loading so that they could be used over a wide range of main and branch lines. I think if you can find photos of similar cars you will see that two axle trucks were rare, and three axle the rule. And you are right they look better besides. The latter introduction of streamline cars used lighter weight materials that reduced the axle loads and caused the switch to two axle trucks. <br />Will
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