**** SOME of the SP B-50-27 box cars had the earlier ends without the extra thin rib at the top. ****
**** I've enclosed two photos to show this - SP 100303 and 100441. Evidently the ends changed during the construction period. ****
SP 100303 has the IDN-2 end that to my knowledge has never been offered in model form - thin top rib with the bottom of the top rolling pin flattened.
SP 100441 has a version of the end I've never seen before - no top stiffener with a flat bottomed top rolling pin - another opportunity for a niche product!
The B-50-27 had a 10-0 IH body with 6' door and 10 panel sides - For that you will need the Intermountain 1937 AAR body (which has a blank space for the car end).
**** The GN 11000 series had the earlier ends. ****
GN 10' IH 12 panel cars with the IDN-1 end:
2525 - 2549 (3/1948)
10900 - 11199 (2/48)
11200 - 11374 (3/48)
GN 10' IH 12 panel cars with the IDN-2 end:
11375 - 11624 (6/48)
11625 - 11874 (6/48)
18000 - 18499 (6/49)
18500 - 19499 (9/49)
19500 - 20499 (11/52)