Rick,
a time ago I was looking at this, but drew a blank, meant to get into the patents and have a look there. But as usual I went off another tangent and didn't return.
There just isn't enough time left.
I think I had drawn a conclusion those Castiron columns might have been from a commercial supplier rather than the UP (umbrella) Railroad water dept.
I say this because the D&RG S.G. line had same at Malta, Tennessee Pass, Pando and Rifle, also B.V. had "similar" without the rings. Walsenburg was also another.
The D&RG N.G. lines: Only one that I've seen so far, that was at Cedar Creek.
Pando, Salida Regional Library Photo
Rifle, Barriger Library Photo
Tennessee Pass, Barriger Library Photo
Malta, Barriger Library Photo
I've seen the photo of the U.P. Shops tank you speak of, that was dated on the print Sept 27/90.
The U.P. line that diagonals across the NE corner of Colorado had CI columns(but knee braced like Elk Cr.) at Orchard and Snyder.
Boulder also had one, not that they are readily apparent in these pictures.
Paddock Collection. Boulder Library Photos
I didn't mark it down as it was a S.G image but if I can find my way back to what I saw in passing, an unknown location shot of a Tank, which I'm dead certain is at Boulder close up.
D&RG
Rifle
Tennessee Pass
Malta
Buena Vista(no rings)
Walsenburg
Cedar Cr.
UP + Subsidiary lines
U.P. Shops Denver
Boulder
Snyder(elk cr style bracing)
Orchard(elk cr style bracing)
Elk Cr.
3Mile
Idaho Springs(uptown)
Silver Plume(?)
UpSideDownC
in New Zealand