Most of the wagons are from the Soviet era, largely from the 81-717/714 series and some trains from the 'D' and 'E' series. The stock, however, is refreshed. The "Slavutych" trains began to replace the old trains of predominantly 81/7021-7022, 81-540.2К/81-714.5М and 81-7080 series. Of course the metro's first line was served by carriages of type D since the very opening. In 1969, all these carriages were given to Saint Petersburg metro. In exchange, the line received carriages of series E then later carriages of series Em-501, Ema-502 and Ezh, Ezh1. In 2014, most carriages of types E and Ezh were modernized and converted into type similar to type 81-7021/7022, it's known as type 81-7080/7081 or E-KM, with new engines, interior and exterior. All of the trains contain an audio system, which announces the stations and transfer opportunities to other Metro lines. At "Arsenalna" station, there is an announcement for museums in the area. In addition, most of the older trains are fitted with an overhead video information system, which provides visual information to passengers regarding the current and the next stations and transfer opportunities between lines. While the train is in transit between stations, the system displays advertising (both in video and ticker forms), recreational video content, and local time. Kyiv Metro also has some special service trains, namely: In December 2016, the Kiev City Council announced that it is going to buy 709 new trains by 2025 for ₴14.96 billion (then 572.6 mln USD), 276 of which will substitute the older trains whose operation terms have expired, and another 62 for Syretsko-Pecherska line to keep the interval. The Kyiv Metro is managed by the city-owned municipal company "Kyivsky Metropoliten" (formally formerly known as "Kyivsky ordena Trudovogo krasnogo znameni Metropoliten imeni V.I. Lenina") which was transferred in the early 1990s from the Ministry of Transportation. The Metro employs several thousand workers in tunnel and track, station and rolling stock management. In addition to being state sponsored for operation, income comes from ticket sales and from advertisements (controlled by a daughter company "Metroreklama") that are displayed in most stations.