Ted Schnepf inquires:
Cubic capacities were either 2601 or 2550 (steel end cars had 36'5" IL).
Photos show these cars with inverse corrugated steel ends, which would date
the application of steel ends to the early 1920s. But not all of the cars
got steel ends. Note also that many were built for both the NYC and MC
with 10' side doors. Most of these were later rebuilt with 6' doors, but
many MC cars had the door openings enlarged to 12'.
Richard H. Hendrickson
Ashland, Oregon 97520