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For a good writeup on the Reading 4-4-4 see Fred Westing's APEX OF THE ATLANTICS - his history of the Pennsy E6 (one of the greatest locomotive books ever written, BTW). It seems that neither the leading or trailing trucks of the 4-4-4 were equalized with the drivers. This allowed loss of adhesive weight when the drivers were in low spots, and overloading of the driver axles when they were in high spots. It also contributed to instability at high speeds. The 4-4-4s were all rebuilt into conventional 4-4-2s with the trailer equalized with the drivers. None were ever equal to the E6, which, interestingly, had the lead truck equalized with the #1 driver and the trailer equalized with the #2; the two drivers were not equalized together. Old Timer
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