The long ton is used for petroleum products such as aviation fuel. Deadweight ton (abbreviation 'DWT' or 'dwt') is a measure of a ship's carrying capacity, including bunker oil, fresh water, ballast water, crew and provisions. It is expressed in tonnes (1000 kg) or long tons (2240 pounds, about 1016 kg).
Trains between Naples and Sorrento depart once every half hour and take about 55 to 68 minutes in duration. Thus, to get from Rome to Sorrento, you would first take a train to Naples, where you would switch to a Circumvesuviana train down to Sorrento.
The high-speed trains between Venice and Verona only take about an hour in duration. There also happens to be regional trains between Venice and Verona, which can take anywhere from 1.5 to 2.5 hours in duration. Trains in Italy can be booked within the 90 days of an intended date of departure.