Dennis and all,

The Rio Grande narrow gauge lines rebuilt some boxcars
in the 4000 series into long cabooses at an early
date...these cars lasted until the end of operations
in 1967. I believe that the rebuilding amounted to
"jacking up the number and rolling a new car under
it", since there is very little resemblance to the
original car. In the wooden car era (which lasted
until the end of operations on the narrow gauge) this
probably was a common practice, since the wood
probably only had a 20 year life span in service.
There are further documentation and photos in the R
Robb series of photo books

=====
Bill Daniels
Tucson, AZ

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