Pro
If you are planning to repaint the car I would consider C&O, Erie of NKP. The Van Sweringen Lines were fond of Viking roofs.
http://www.steamerafreightcars.../1937aarpdfmain.html
I'm curious if our PRR experts can provide more info on early X29B rebuilds. Did any of them have Viking roofs?
For those interested in the Atlas X29 they can be found in the six Atlas product announcements....
http://www.atlaso.com/ox29boxcar.htm
http://www.atlaso.com/ox29boxcar1.htm
http://www.atlaso.com/ox29boxcar2.htm
http://www.atlaso.com/ox29boxcar3.htm
http://www.atlaso.com/ox29boxcar4.htm
http://www.atlaso.com/ox29boxcar5.htm
...or under Middle Division on the special runs page.