Bettendorf underframe

Mike Calvert

I am making an SP Class B-50-6 DS boxcar with Bettendorf I-Beam Underframe. Other 'Harriman' roads- i.e. SP and UP subsidiaries- also installed these cars.
I see on Westerfield's list (#12000) that MILW had a lot of these cars.

Can anyone help me with information on these MILW cars?
Does anyone know if any other railroad had boxcars of this type?

Thanks for any information.
Mike Calvert

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