Nothing really crazy. If you buy the ticket in advance it’s usually $6. Much cheaper than a monthly pass or even 10 ride pass (if you can get them all at $6. Sometimes they’re a little more) And that particular train (656 am) there’s only 1 stop between providence and back bay. It goes providence -> Rt 128 -> back bay -> south station. It might say longer on the Amtrak app or website but it’s literally 35 minutes from providence to back bay. If it’s slow or there’s traffic on the tracks maybe 40. It’s very doable in my opinion and I don’t find it really taxing at all.