Well, other lines than NYC used track pans, including CNJ and the NY&NE in the 
19th century. That said, I think the vents were low on the tank, not on the top.

Pieter E. Roos


--- On Fri, 5/17/13, ashpan.clinker <[email protected]> wrote:

> 
> That NYC operation had special vents to let the air out when
> the water trough intake was dropped into those water pans
> and the tender was cruising at 80 MPH and low altitude.
> Tutherwise there would be a split at the seams. The rest of
> the world usually just stopped under the spout of a water
> tank, opened the hatch, and poured the water in the tender.
> There was plenty of room for air to escape, no special
> openings needed. It was imperative that the one filling the
> tender, usually the fireman, but not necessarily so,
> followed the edicts of rule 19, other wise he just may be in
> the tank, so to speak.
> 
> Crusty N' Grumpy Rusty.
> officially know as James Rustermier in this neck of the
> woods.
> 
> 
> --- In [email protected],
> "Ed" <Loizeaux@...> wrote:
> >
> > > If you noticed the before picture, the holes for
> the marker lights were already there.
> > > Alan Lambert
> > 
> > Is it possible that those holes are air vents needed to
> let the air out so that the water can get in easier?  
> > 
> > Just thinking......Ed Loizeaux  (aka Ed L.)



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