Travel from Nocelle to Rome

Here’s a link from Google maps showing directions from Nocelle to Rome using public transport (bus and train) that might help:

https://maps.app.goo.gl/1BYx3Y5zagY4VB6w8?g_st=ic

Bus from Novelle to Sorrento
Circumvesuviana train from Sorrento to Naples
Fast train from Naples to Rome

No need to purchase bus or Circumvesuviana tix in advance ( you can’t)

You can book your fast train tix at Trenitalia

https://www.trenitalia.com/content/tcom/en.html

Allow plenty of time as the bus and Circumvesuviana will be poky slow and often run late

You might consider hiring a driver from Nocelle to Naples if your budget allows
I’d expect the whole trip to take close to 4-5 hours

ETA
Check bus not sure there is one in Nocelle, you’d have to get to Positano

Ask your lodgings what they recommend
Nocelle is a bit off the beaten track
How are you getting there and from where??

The timing all kind of depends. Most direct on your own would be a bus down to Positano, ferry to Salerno. Salerno’s train station is a short walk from the dock and has direct fast trains to Rome. Hiring a car to get you to Salerno might be worth the time and peace of mind. Perhaps your B&B hosts would have advice on that front.

I was sort of thinking bus to Positano>Ferry to Salerno>train to Rome (or car service to Salerno> train to Rome) route too.

A "fast" train to Rome from Salerno will take approx. 2 hours, give or take. A ferry from Positano will take 1 hr, 10 minutes. Not sure about bus time from Nocelle to the Positano stop nearest the pier; I see mentions from guests at some Nocelle properties of bus service to Positano, and that it takes 30 minutes or so but check with your B&B. Add in time to walk from the dock in Salerno to the train station + wait time for train, depending on coordination of ferry arrival and train departure.

One caveat: ferry service from Positano can be suspended if weather/sea action makes it unsafe for the boats. As well, as you haven't told us when your trip will be, ferries don't operate from Positano from around Nov. 1 until April.

Like Christine, I am wondering how you're getting to Nocelle in the first place, and what else, if anything, you're planning to do during your stay?