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Unread 08-12-2011, 17:05   #4
Traincustomer
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Join Date: Dec 2008
Location: ar an traein
Posts: 600
Default SDO?

What does the abbreviation "SDO" mean?
"School days only" as in Bus Éireann timetables of years ago springs to mind (!!!) but I know it must be a railway-related term! Thanks in advance.
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