The metro system of Milano consists of four lines with a total length of 100 km. The electric system is mixed, with trains of some lines taking
their electricity from additional rails, some from overhead catenary wires. This picture is from the M1 line, from the station of Cadorna FN. This line
was opened in 1964 with its latst addition in 2005. This line 1, electrified at 750 V DC, uses a fourth rail system, although the same line also
supports overhead lines in some stretches and depots; this allows Line 2 and 3 trains to use Line 1 tracks to reach a depot. This is a so called Ansaldobreda
Meneghino train. They were built since 2009. They have multiple electric systems, which allows them to be used on Milano's metro lines 1, 2 and 3,
either 750V DC or 1500 V DC from either a third rail or from a catenary wire. Milano's metro lines are colour coded and the green colour signals that
this train serves on line M2.
Picture from the station Cadorna FN 7.7.2019 by Ilkka Siissalo.