zagarolo by train

Not being familiar with Zagarolo at all, you sparked my interest, and I checked Trip Advisor. TA lists the #1 attraction in Zagarolo as a mini-golf place. That says something, I suppose. Please let us know if you find more excitement there. The name itself is pretty neat, Zagarolo.

For the most part, Termini. There are few oddball connections (for 5 euro less) with changes at Trastavere or Ostiense, or Tuscolana.
How about the race track at Capannelle.

Zagarolo by train will start at the Rome Termini (main train station.) And trains run every few minutes on the 20 minute trip.

Once at Termini, you need to look for the digital departure display and look for Cassino, Frosinone, Caserta or Colleferro listed as a final destination for the train that stops at Zagarolo.

Check the departure track (BIN) and look for the little display screen at the beginning of the track.
Just make sure Zagarolo is mentioned on the small display at the beginning of the track. 90% of the trains to Cassino, Frosinone, Caserta or Colleferro do stop at Zagarolo, but you need to verify the train you're getting on is not one of the 10%.

FYI: The train station is maybe 2-3 miles from the actual town of Zagarolo.

The town was where they made Roman soldiers' helmets, and the big gymnasium to train gladiators was there.

The main street of the city is maybe 50' wide, but the buildings on each side of the street are built on 5-6 story deep foundations and there's a deep ravine below. This town is built down instead of up.

The ancient pagan temple of Palestrina is a 5 minute ride, and it's an incredible sight halfway up a 2500' mountain.
Tivoli is only 25 minutes, and its famous gardens are well worth seeing.
Monteporizio is about 20 minutes, and it was a Roman villa and medieval settlement. The Dome of XVIIth century and the Bourgeois Palace are close by.
The suburbs of Rome just have an incredible number of great sights for visitors to see--and they are so often overlooked.

Thank you all for the good information. I was in Rome last fall and did all the major sites...now I want small town and use that as the base to take the train or bus back and forth to Rome. I'm still putting my travel map together. Right now my next trip is to Philadelphia when the weather gets warmer.