Thanks Jim ! I misremembered the car - it was L&N, not ACL.

On 8/18/2022 12:40 PM, james murrie via groups.io wrote:

There were several cars, basically modified baggage cars, used by several railroads. They ran in regularly scheduled passenger trains.  For example MILW 1046 (if I remember correctly) was a 70ft heavyweight express car that ran weekly between Oak Ridge TN to Hanford WA with radioactive material. Normally ran in "The Columbian", Tr. 17/18 from Chicago and cut out to go down the branch line to Hanford reservation. 

In 1961 L&N had four surplus 10-3 sleeping cars modified to baggage dorms or use by Atomic Energy Commission which were renumbered 1650-1653. Only indication of use was "Return to Oak Ridge in small letters.

And there was also SCL 666 which ran Savannah to Rocky Flats CO.

Jim Murrie

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Tim O'Connor
Sterling, Massachusetts