"roster.xml" does not contain all your loco roster entries. It is simply an index file (containing a few key elements) of the individual "xxxx.xml" roster entry files in the "roster" folder, which is found in the same place as "roster.xml".
You need the "roster" folder, with all its individual "xxxx.xml" roster entry files. Then you use "Rebuild roster index" to create a new "roster.xml".
Transferring just "roster.xml" will make all your locos seem to be in your roster, but all the data (CV values etc.) will be missing and these entries for non-existent files will disappear next time JMRI rebuilds the roster index.
--
Dave in Australia
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On 11 Aug 2017, at 3:53 AM, Jon Miller atsfus@... [jmriusers] <jmriusers@...> wrote:
Never mindmy previous question. I found roster.xml with the 2017
date. That 4.xml was just for the one engine. So I can just exchange
one roster.xml for the other, right?