It’s a monorail train that, with no driver, goes back and forth from piazzale Roma to Tronchetto island…
Venice’s People Mover elevated shuttle trains offer quick (wheelchair-accessible) connections between three points:
Piazzale Roma, where locals and visitors arrive in the city by public bus, airport bus, taxi, or car.
Marittima cruise terminal, where many passenger ships arrive and depart.
Tronchetto parking island, which has indoor and outdoor parking for thousands of cars and is also the arrival point for most tour buses.
The People Mover is a cable-operated train system that’s similar to the automated trams in many large airports.