Nalco Weed Sprayer and tank cars

Doug Forbes

I am looking for help in potentially modeling this Nalco weed sprayer train that was running on the C&EI in 1959 as photographed by J. Parker Lamb.  I am looking for ideas on a good HO scale starting box car to modify into the weed sprayer as well as who might have owned the tank cars (I think Nalco owned them from other research I found) what would be good starting models for them as well.  I'm looking for any guesses or hunches or commentary you might have.  
Thanks to all!

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