Castellammare di Stabia to Siderno trains might be a good value for money solution: travelling in Italy by train is often rather cheap and faster than taking a bus indeed Trains leave from Castellammare di Stabia and arrive at Siderno, Napoli Centrale every about 2 hours on average. If travelling with Trenitalia, you need to know the Castellammare di Stabia to Siderno train schedule: the first train leaves at 06:20, while the last ride is at 20:58. A Castellammare di Stabia to Siderno train cost about 2 €. But how long is the train ride from Castellammare di Stabia to Siderno? Your journey takes about 6 hours on average.