the metro of Milan

the Metro of Milan
The pictures on this page are taken in june 1998 in Milan. The Milan Metro net exists of 3 different lines:

The Red line, lenght 24.9 km, oldest part used from 1964, newest part from 1992;
The Green line, lenght 33.2 km, oldest part used from 1969, newest part from 1994;
The Yellow line, lenght 11.2 km, oldest part used from 1990, newest part from 1991.