Bulgarian Post issued stamps dedicated to Sofia Metropolitan.
The Sofia Metropolitanis the rapid transit network servicing the Bulgarian capital city Sofia. It began operation on January 28, 1998. Currently, the Sofia Metro consists of two interconnected lines, serving 27 stations, with a total route length of 31 kilometers, being the 34th largest European metro system behindAmsterdam Metroand before Budapest metro. The Metro links the highly populated districts of Lyulin–Mladost (Line 1 – Red) and Nadezhda–Lozenetz (Line 2 – Blue).