Not sure that I've put this all together here on TA before, but it may be useful if you'll be travelling down by rail from Rome etc...
Since the completion of its extensive makeover, changing trains at the main station in Naples - Napoli Centrale - is now simpler than ever; essentially, all you need do is look for signs saying "Circumvesuviana" and follow them...
You'll first go down the new main escalator...
http://www.pbase.com/isolaverde/image/123069561
... then along an underground passage...
http://www.pbase.com/isolaverde/image/128343808
... and eventually you'll arrive at the barriers...
http://www.pbase.com/isolaverde/image/125760466
Once there, turn around and you'll see the new ticket office.
For "Pompei - Scavi" take the Sorrento train; the "BIN" column on the displays will shows which platform (binario) you'll need - number 3 in this example...
http://www.pbase.com/isolaverde/image/130148215
Hordes of people are likely to be making the same journey, but having a route map may still help: this one has all of the CV's lines...
http://www.pbase.com/isolaverde/image/124987094
... and this shows just the stops between Naples and Sorrento...
http://www.pbase.com/isolaverde/image/128288647
..............................
We came through the station today and saw them working on a new lift, near the main entrance. It looks to only go down one floor, and perhaps won't allow wheelchair access to the Circumvesuviana platforms, for which the line's terminus (one stop away at their Porta Nolana station) is probably still a better choice.
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Trust that will make things a little easier,
Peter




