Re: A Doubleheader of the Distant Past . . .

guymonmd Wrote:
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> It appears that 168's drivers are larger
> than 315's


It was quite common for a smaller-drivered but often more powerful "freight" locomotive to help a "passenger" engine with less t.e. but potentially greater speed overcome a steep grade — see the first photo on [ngdiscussion.net] for a classic example.  Out west on the S.P. standard gauge line slow but powerful 2-10-2's with 63" drivers were the usual helper power coupled in front of the much faster 80"-drivered Daylight 4-8-4's for the climb up Cuesta Grade north of San Luis Obispo.