Thanks to the numbering system the eight-digit number combines a unique identification number attributed to a railroad car fleet unit, its basic property and number readout validity code protection.
The first digit specifies the railroad car type:
— 2 — covered freight cars;
— 4 – platforms;
— 5 – proper cars;
— 6 – open box cars;
— 7 — cisterns;
— 8 — freight refrigerator cars;
— 3 and 9 – other types (specialized and etc.)
The second digit refers to the number of axes and basic properties of the car. 0-8 means four-axe, 9 means eight-axe cars. All six-axe cars and transporters are referred to as other cars with “3” at the beginning of the number (six-axe ones have “6” as a second digit, transporters have “9”). Apart from number of axes the second digit also determines:
— for covered railroad cars: cubic capacity;
— for platforms: frame length;
— for 4-axe open box cars: presence of hatches at the bottom and gangway doors;
— for cisterns: specialization.
The third digit is an additional feature of the car.
The fourth, the fifth and the sixth digits in the car number determine the car progressive number and contain no indication to any attribute.
The seventh digit “9” means that the car has a vestibule platform.
The eighth digit is the control one.