If the mean the 211-4 versions, not that rare, Jon.

    Probably should have stated the drawings for the cast commonwealth part of the tank:-)!  The tanks made are accurate for the most part except for that casting.

-- 
Jon Miller
For me time stopped in 1941
Digitrax  Chief/Zephyr systems, 
SPROG, JMRI User
NMRA Life member #2623
Member SFRH&MS

If the mean the 211-4 versions, not that rare, Jon.  Fairly sure Temple has it.  So does the SDMRRM Lib.  In fact they sold me their extra copy of their entire set.  

Here she is....as revised to 1951.  

The large dome, AJAX and tank dia is close (inside dia 9' - I guess it could have had 3" of insulation?)  But inside 35'-7.5" length?   This puts the AT&SF / GAT ID in some doubt if his is truly just 31'. 

Hmmmm...

Jake Schaible

San Diego

But what do I know ... for me time stopped in 1927!

It is classified as a TK L

    Drawings for the TK-L are somewhat rare which is why no accurate models have been made.  The few that have been made (brass, etc.) have the cast commonwealth part of the tank done incorrectly.  A dimension drawing of that cast part, of the tank, would be helpful in maybe producing a resin model.

    Google ATSF TK-L

-- 
Jon Miller
For me time stopped in 1941
Digitrax  Chief/Zephyr systems, 
SPROG, JMRI User
NMRA Life member #2623
Member SFRH&MS

So gross geometric vol of the tank is ~ 16,437 gals?  Of the top of my head, sounds big (fat) for the late 20's.  

Are you sure the road numbers are 108,00-108,099 and not 100,800 - 100,899?  If so, AT&SF had a TK-L 100 car series of 16,200 gal delivered 1930 from GAT.  ICC103 with a 5'9 dome.  (Source, Occhiello - of course, Larry might also have an error in his numbers, but his does fit the AT&SF number series.)

If not, and other clues?  Like the word "Berwick" anywhere? 

Without an image (that might show design similarities) I'm at a loss to help you further.  A long shot, but to develop a hit list, you might check lot list for 100 car orders in dates just after then.  (UMSL has the ACF lot list, for example). 

Research has benefits and decades old city improvement reports can offer details to help a new project. A couple of B&O freight facilities are the focus of the latest DesignBuildOp blog post. Eagle-eyed readers will note a few interesting freight cars in the photo margins.

http://designbuildop.hansmanns.org/2018/10/12/bo-freight-houses/

Eric Hansmann