indoor transport trackless transfer trolley
Trolleybus – Wikipedia
The trackless trolley was often seen as an interim step, leading to streetcars. In the US, some systems subscribed to the all-four concept of using buses, trolleybuses, streetcars ( trams , trolleys ) and rapid transit subway and/or elevated lines (metros), as appropriate, for routes ranging from the lightly used to the heaviest trunk line.
2021 China Used for transporting metal wire coil storage
Trackless transfer vehicle for handling metal wire coils and batter...