In article , Mark Brader
writes
and used to be a 13bis).
First I've heard of it, if so.

Look for maps of the 1960s and 1970s. The western branch of the old 13
was 13bis (though unlike 3bis or 7bis trains ran all the way from the
southern terminus, rather than just on the branch).

Aha: http://www.paris.org/Maps/Map3/map.cgi/h3?143,29

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