RI 35062, Chicago, Rock Island and Pacific Railroad, BLT/NEW 7-69 Athearn 50' small plug-door boxcar, stock#1326 w/Details West's 50' Evans 20" Cushion Underframe, stock#183
GN 36905, Great Northern Railway, BLT. 4-1964/NEW 4-64 Athearn 50' plug door boxcar stock#2317, released in 1997 (1 of 2-car set, Special Edition) w/Details West's 50' Hydra-Cushion Underframe stock#182
The XM series 36800-36999 was built by AC&F in 1964, and equipped the Hydra-Cushion underframe. Some of the cars had red doors. (Great Northern Equipment Color Pictrical Book One p64, GN Color Guide to Freight and Passenger Equipment p57)
GN 36982, Great Northern Railway, BLT. 4-1964/NEW 4-64 Athearn 50' plug door boxcar stock#2317, released in 1997 (1 of 2-car set, Special Edition) w/Details West's 50' Evans-Cushion Underframe stock#181
SLSF 8167, St. Louis-San Francisco Railway, Ship it on the Frisco Athearn 50' plug door boxcar stock#? w/Details West's 50' Hydra-Cushion Underframe stock#182
SSW 30043 Hydra-Cushion for Fragile Freight BLT 1-59/PB 2-63 Atlas HO Trainman item#20 002 022, 40' plug-door box car 2013 converted to Hydra-Cushion by the poster