Contact Network Equipment 
Proizvodnja OSO d.o.o. is a company that specializes in the design and manufacture of suspension and jointing equipment and metal structures for contact networks used for:
- electrification of railway lines,
- electrification of urban railway lines (electric trams),
- replacement of equipment during maintenance of existing contact networks.
Production programs:
- suspension equipment,
- tensioning equipment,
- catenary equipment,
- insulators,
- steel cross arm braces , and
- fasteners and supporting structures.
The contact network equipment manufactured by the company is designed in compliance with the recommendations of and standards applied by developed European countries.

During the past several years, the company has designed equipment for contact networks used for electrification of railway lines and urban railway lines (electric trams) with the following voltage levels: 0.66 kV DC, 1kV DC, 1.5 kV, 3 kV DC, 15 kV AC and 25 kV AC.
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