The HZ 21 78 154 0000-7 »Gbkks-z« freight car is a modification of the more common »Gbs« series (no. 150). Photographed at Koprivnica railway station on 2000/09/18 at 7:45.

Explanation of the numbers and letters:
21 RIV = two-axled railway owned freight car, apt for international traffic [RIV = Regulations concerning the reciprocal use of wagons in international traffic]
78 = the ID-number of HZ [Croatian Railways]
154 = number of the freight car series, also represented using the letters »Gbkks«:
G = closed wagon
b = with single axles, length exceeding 12 meters, and the available volume exceeding 70 m^3
kk = load capacity 20 to 25 tons
s = apt for the speed up to 100 km/h
z = equipped with mechanic brakes
0000 = number of the unit
7 = control digit Photo & scan: Tin Sipos