15/16 and lasted for the rest of that month. During that time, all railway traffic across Yugoslavia was suspended, as an approximate of 50,000 railway workers from all railway stations, furnaces and workshops rose up against violent suppression of workers' rights in light of difficult socio-economic circumstances. At its peak, the violence resulted in 14 killed on Zaloška cesta in Ljubljana. Working people on the Yugoslav railways celebrated this day solemnly and laboriously, recalling the many events of the growth and maturation of the workers' movement and everything that led to the historic general strike. It was celebrated annually since its inception in 1950 until breakup of Yugoslavia in 1991. Rolling stock In its beginnings, the JŽ used mostly Austrian and Hungarian-made steam locomotives. Electric and diesel locomotives were introduced in number from the 1960s onwards; electric locomotives were acquired from Ansaldo (Italy); Alsthom, ASEA also supplied some classes, and locomotives were also license-built in Croatia and at Electroputere in Romania; in the 1980s the indigenous AC electric JŽ series 442 was developed by Rade Končar. Most of the mainline diesel locomotives were from GM-EMD with a substantial number of Brissonneau et Lotz designs (some licenses built by Đuro Đaković). Shunters were acquired from MAVAG, Jenbacher werke, and also license-built by Đuro Đaković. The railway also operated locomotives from the Lyudinov works, Soviet Union, ex-DB V60 shunters (Germany) and high power Krauss-Maffei ML 2200 C'C' type. Railcars, EMUs, and DMUs were sourced from Spain, Italy, Hungary, Germany and the Soviet Union from a variety of manufacturers. Classification system A new numbering system was tried for the new standard locomotives built from 1930. All locomotives were renumbered by 1935, which was valid for steam engines. The locomotives on the Bosnian gauge were classified 70-98 and for the gauge 99.2, 99.3 and 99.4. A three-plus-three digit class designation system was used from the late 1950s - the first digit indicated the power type of vehicle: 0, 1 and 2 were reserved for steam traction, 3 indicated 3 kV DC traction; 4 25 kV AC traction; 5 multisystem traction (not used until the Slovenian Railways, which inherited the Yugoslav naming scheme, introduced class 541 electric locomotives), 6 diesel electric; 7 diesel hydraulic; 8 diesel mechanical transmittion and 9 an infrastructure or works vehicle. The second digit indicated the vehicles gauge and axle arrangement: 0, a narrow gauge railcar; 1, a standard gauge railcar;