Tim O'Connor asked: "I didn't follow that exactly -- what do you mean by "earlier design" for the 730-B?
I meant Lot 730-B is a 10 ft 6 in Modified 1937 AAR Boxcar with 5/5 ends, and not the Postwar AAR boxcar represented by the Branchline Blueprint / Atlas kit.
"The 729-B's were the 10-0 cars The 730-B's were the 10-6 cars"
Correct. You must have looked at the handout from my NYCS boxcar talk that I gave last week on Hindsight 20/20 13.0.