Sam: Please take no offense, but the Erie Engines shared the same trailing truck as the early Lima 2-8-4's. The Erie S4 was built in 1929; the C&O 2-10-4 in 1930......and it had a much larger boiler, grate area, relative weight, etc. Think the C&O locomotive was a fresh design and a radical departure from what had been developed in the past. I might propose (without a shred of evidence!) that the C&O 2-10-4 was derivative from the Burlington 2-10-4 of 1927. But, who knows at this late date, but always fun to speculate!
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