Russo Loco Wrote:
-------------------------------------------------------
> 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.
>
> - Gramp
s
>
> * 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