Mike Brock wrote:

Fraley uses several terms for contents that I'm not sure of. He uses "CO"
for company [ UP ] and adds "L" or "lump" followed by "Coal" for company
lump coal, presumably for steam loco use. He uses "Co RM" or "RM company".
I'm not sure what the "RM" is.

This might be "roadway material," a term also used on SP and perhaps with origins in the Harriman era. Most "general purpose" boxes and flats in MOW service on SP were called "roadway flat" or "roadway box" for a similar reason.

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