Re: Outside frame steam engines.... Why?
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The 190 class had 48" drivers and weighed less than the 70 class with 44" drivers. I suspect less tractive effort and more prone to slip. Just a surmise. Definitely the appearance was altered in No. Carolina.
The NdeM HR-01 class would have been heavier but I have a suspicion that the coupler height off the railhead may have been lower on Mexican narrow gauge. Unconfirmed.
Does any know if there were ever built any 3' gauge articulateds overseas?