Stefan Lerche' wrote:
"In particular I am interested in detail/modelling information or
photos of UP 40' DD steel ACR boxcar series #9100-9229 and Rock Island
40' SD steel boxcar series #20000-20050, 20060-84."
A couple more comments:
- Prototype photos of both UP and RI cars appeared in Railway Prototype
Cyclopedia 6 (unfortunately out of print).
- Sunshine 31.10 models the Rock Island cars.
- Use the Intermountain Modified 1937 AAR boxcar kit (Stock No. 40899)
as a starting point if you can't get the Sunshine kit.