Tolong jelaskan mengenai Italy dari Lebar sepur ganda

The Potenza  Avigliano Lucania line in Italy is a dual gauge rail with  and  tracks.

In Japan, the national standard is  narrow gauge. Dual gauge is used where the  Shinkansen (bullet train) lines join the main network. For example, part of the Ōu Main Line became part of the Akita Shinkansen and was converted to dual gauge in a limited section. The longest () dual gauge section in Japan is near, and in, the Seikan Tunnel. Sections of the Hakone Tozan Line are among a number of other dual-gauge lines.