Civitavecchia NEW shuttle bus stop
The location has moved from the white tented area opposite the fire station.
It is now an 8 min walk from the fire station to where the new bus stops are.
Pic showing walking route.
If you want to go from
ship to train station the €3 shuttle bus now starts from the ship itself - you no longer take the shuttle bus then swap to the station bus.
Pic showing busses at the cruise terminal
Do you know roughly how many buses there are waiting at any one time? The link mentions they run every 20 minutes so I’d assume that there may be several especially if you’re looking at a ship with 1000’s of passengers.