This page describes a future product in the research stage.
GN-03 - CPR Little Otis Gondola Coke Rack
The CPR had approximately 226 Otis gondola cars with coke racks. Twenty-six cars with National doors, numbered 345349-345399 (odd numbers) were outfitted. The builder photo below is an example. And there were 200 cars with Hart doors, number series 346001-346399 (odd numbers).

This is an add-on product offering for the GN-01 Hart-Otis kit.
NOTE: The GN-01 model is the Hart-Otis car with 5'-0" inside height. The 346001 sereis cars were 4'-6". For those that are concerned... that's a 1.75mm height difference.