On Aug 4, 2019, at 1:56 PM, Michael Aufderheide <MononInMonon@...> wrote:

Bill,

Yes, those were free running general service boxcars.  

However, some 50 footers with this scheme seem to have been in assigned service between the RCA factories in Monticello and Bloomington Indiana.  There was a similar scheme with the words "HIGH SPEED MERCHANIDISE SERVICE" in the light gray band that were in LCL service from the early 50s until the late 50s.

Regards,

Mike Aufderheide