Modeling the "Fargo Area Rapid Transit" in O scale 3 rail.
If these are the Gunderson Cars, then it would be only made in brass right now, and then it would be extremely limited.
Are you looking for a typical O Scale production run car from somebody like ATLAS O?
With those 48" curves you need an S Scale Version with O Gauge Trucks so the car can be run in trains. The best you could do is suggest and request the Flexibeam for the MTH RailKing line, Lionel LionMaster line, or Atlas O Industrial Rail Line. At 84' Long in S Scale proportions the car will be around 16" long, the maximium length for a car that can negotiate 48" Diameter Curves.
Andrew
Watch my videos on-line at https://www.youtube.com/user/AndrewNeilFalconer
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