What size are the wheels of this particular articulated autorack car (Currently modeled by Atlas in HO and N scales)?
I believe that this information is relevant for the your pictured car.
http://www.trainweb.org/nwrp/ttx/bttx880387data.htm
Cheers, the Bear.
"One difference between pessimists and optimists is that while pessimists are more often right, optimists have far more fun."