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Venice’s Santa Lucia railway station is packed as visitors scuttle across the concourse towards the water-bus stops.

Transport officials also closed the water-bus system, except to outlying islands, due to the emergency.

There are several water-bus lines designated by a colored flag on the stern.

Mr Falconi told Ansa that he would be putting his proposal of random testing to the city council on Monday, and that it would apply to all who operate a craft in the watery city, "from water-bus drivers to ship hands".

A one-day water-bus strike has crippled this shimmering city.