Sofia Metro | Софийско метро | ММЗ/Метровагонмаш 81-717.4/714.4 (modernized)

Just a short footage of modernized 81-717.4/714.4 trainsets in Sofia. There are two colour schemes, a red-white livery and a green-white livery, which is generally more common. English: #Sofia Български/Bulgarian: Софийско_метро#Тип_81_–_717.4/81_–_714.4