Re: Mason 461, 0-4-4T or 0-4-2T

Russo Loco Wrote:
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> Interesting photos, Bruce -
>
> That must be one of the earliest uses of a
> Wahlshaerts style valve gear - or at least much
> closer to Wahlshaerts than Stephenson.
> And very clever to have such long lifting links in
> order to minimize the effect of curves to 'notch
> her up' when running forward.*    
> OTOH, it's hard to imagine how a connection from
> the Johnson Bar to a Stephenson valve gear could
> have been accommodated.
>
> - Gramps
>
> * Or 'open her up' a notch or two in reverse.

From, comparing Mason to Fairlie:
[wikivisually.com]

"Although better, Mason's improvements took up much valuable space in between the driving wheels, forcing Mason to use an outside valve gear, generally the Walschaerts valve gear. "

Bruce