BOB2 -- I'd like to know more about that. What do you think might have been the reason for wanting the rod to be down in normal (i.e. forward?) operation? Perhaps it was related to the "preferred" operation of the reversing lever in the cab --whether to "push" or to "pull" for the same result. I can't think of any reason why one configuration would be mechanically preferable to the other, since the upper and lower halves of the rocking link are symmetrical and the valve events would therefore the same whether they are derived from the top or the bottom of the link (so long as the motion of the link is reversed with respect to the preference for "radius rod down" versus "radius rod up" as the normal position).
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