Following up on my earlier email. In July 1957 the following boxcars were
listed in the NS fleet.
AAR Series To Qty % FLEET Model I.Length I. Height Doors (WxH) Notes
XM 25000 25499 481 48.68% 0.00 40 6 9 3 6 x 8 8 1932 ARA
XM 25500 25752 238 24.09% 0.00 40 6 10 6 x 9 4 1937 AAR
XM 25800 1 0.10% 0.00 50 10 9 5 x 6 10
XM 26000 26024 24 2.43% 0.00 40 6 10 4.125 12 6 x 9 8 double door
XM 27000 27249 244 24.70% 0.00 40 6 10 6 6 x 9 10 1944 AAR

These same series are in the 1959 edition with an additional 28000 series
that at first glance appears to be a renumbering of the 25500 series
So I am even more confused regarding the custom run cars.

Brian J Carlson P.E.
Cheektowaga NY