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The Naples–Salerno high-speed railway line (also known in Italian as the Linea a Monte del Vesuvio, meaning the "line up Mount Vesuvius") is a link in the Italian high-speed rail network opened in June 2008. The 29 kilometre-long line is one of the new high-speed lines being built to strengthen rail transport system in Italy and in particular freight and passenger transport in Campania. The line is part of Corridor 1 of the European Union's Trans-European high-speed rail network, which connects Berlin and Palermo.
The infrastructure of the new line was completed in April 2008 with its electrification, which operates at 3 kV DC, not the 25 kV AC used on most new high-speed railways in Italy. It became available for training in May 2008 and for public operations in the following month. The line allows the reduction of congestion of rail traffic on the Naples–Salerno coast line, as trains can travel on the new line.
The new line starts at Roma Est junction, which allows trains from the Rome–Naples high-speed line to continue south on a branch to Casoria junction where there is a link with the main rail node of Naples. The line passes the towns of Volla, Pomigliano d'Arco, Sant'Anastasia, Somma Vesuviana, Nola, Ottaviano, San Gennaro Vesuviano, Palma Campania, Poggiomarino and Striano, through a series of small cut-and-cover tunnels and elevated sections, reaching the commune of San Valentino Torio, where it is currently connects at Sarno junction to the end of the line from Sarno.