By train: if you want to get Pompei from Marine Gate, you must take Circumvesuviana to Naples-Sorrento and get off at Pompeii- Villa of Mysteries. As an alternative, you can take
Circumvesuviana train to Naples-Poggiomarino and get off at Pompeii- Sanctuary. There is also the railway station of Pompeii, managed by Ferrovie dello Stato and served by Naples-Salerno route.
By bus: Sita sud srl manages the Naples- Salerno route and it stops also in Pompeii. Line 4 managed by Cstp leaves from Salerno to Pompei.
By car: take A3 Naples- Salerno motorway and exit at Pompeii. Follow signs up to archeological sites.