A second class passenger car of class 74 with personal number 50 52 29 74 061 - 6 on railway station Mezdra in composition of the fast train from Sofia to Varna.Explanation of the numbers: "50" - passenger car with perennial wheel base , non sertificied to UIC / RIC and used by inwardly announcement device ; "52" - the ID number of BDZ (Bulgarian Railways) ; "29" - second class passenger car with 9 compartments or 18 - 19 rows ; "74" - class of passenger car - it`s determined by the 130 km. per hour and 2 kinds of heating - steam heating and various kind of electric heating - 1. alternating current of electricity: 1500V~50Hz ; 2. direct current of electricity: 1500 V= "061" - number of the unit ; "6" is the control digit.

Digital photo Veselin Malinov , e-mail: malinov.veselin99@gmail.com Website: http://nightphotos.fotopic.net