Re: C-19's on the C&S

Kelly Anderson Wrote:
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> Because the designer chose to connect the main rod
> to the second driver, #2 has to be that far back
> or the main rod would be even shorter, causing
> even worse problems of angularity, rough riding,
> etc.
>

Perhaps, but the 60 Class engines produced at the same time did not have this space between drivers one and two, and so the stroke was considerably shorter. I don't recall hearing that these were particularly rough riding engines.

I would be more inclined to believe that, since the 70 Class was longer than a 60 and the wheelbase needed to be correspondingly elongated in order to balance out the weight of the engine over the drivers, that they chose the location of the Stephenson valve gear components to add the additional inches. This would give easier access to these parts for adjustment, lubrication and repair.