Center Partition Flat Cars in these roadnames are not likely.
These railroads had many Bulkhead Flat Cars.
8. Santa Fe
9. Southern Pacific
10. L & N
11. SCL
12. Seaboard System
Now CSXT and BNSF have obtained many new Center Partition Flat Cars since the 1980's and 1990's.
GNRR had bright blue Center Partition Flat Cars that look like Great Northern Big Sky Blue, but GNRR stand for Georgia Northern Railroad.
Andrew