You have two train options for Pompei, assuming you are traveling between March and November. There is always the regular Circumvesuviana train (2,40 each way) but you can also choose the Campania Express tourist train. The benefit of this train is that it makes only a few stops, it's capacity controlled so you'll get a seat, the AC works, and there's less concern about petty theft because they are careful that only ticket holders get on and because the lack of stops eliminates the possibility for a quick escape. The Campania Express fare between Sorrento and Pompei is 4 euro (7 euro round trip).
Here is the 2019 Campania Express schedule: https://www.eavsrl.it/web/content/campania-express-2019
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