Company profile

Železničné opravovne a strojárne Zvolen a.s., (ŽOS Zvolen) is the biggest and most significant company focusing on reparation and modernization of motor locomotives and motor railcars in Slovakia. The reparation of railway vehicles has got tradition for 140 years, since the creation of railway manufactory in 1872. From the historical view, the one of the most important year is "1994", when the company formed into joint-stock company, and it separated from The Railway Company of Slovak republic. Repair manufactory of Zvolen become major owner of the company and after that, in 2008 The company have become part of ŽOS Trnava Group.

The current production programme in the field of repairs of railway vehicles offers wide range : motor units and motor locomotives all depends on the customers´ requests. Technological equipment depends on level of technological park of railway vehicles.

Nowadays, ŽOS Zvolen, a.s. expands its business activities not just in Slovakia but also abroad. The main commercial activities of both divisions (LOKO and MP- machine production) are:

modernizations and replace of engines of railway vehicles
repairs of railway vehicles and its agregates
regular examinations, which depends on V25- regulation
repairs of electric locomotives 140, 181, 182, 183,
regular technical examinations, vhich depends on 351/2010 Z. z. - regulation
regular electrical revisions and revision of the pressure tanks of railway vehicles
components for foreign customers in the field of production and repair of railway vehicles
welded structures for railway and road vehicles
repairs of components of railway vehicles

Technological possibilities:

pressing of wheelsets, axles and tires (pressing force: MPa/398t),
drilling of engine constructions ( depth of drilling up to 1600 mm),
repairs of diesel engines ( ČKD- drilling: 230- 310 mm, LIAZ- drilling: 130 mm), CAT, MAN,
repairs of heads of diesel engines with SERDI technology,
grinding of crankshaft ( max. length: 5 000 mm, weight: 5 t),
cutting with plasma: max. cut: 25 mm,
cutting with oxygen: max. cut: 100 mm,
folding: max length- thickness: 4 000/ 15 mm,
coordinate drilling, milling,
turning- horizontal, max length/ max. mean: 4000/400 mm, turning- vertical, max length/ max. mean: 1150-1300/ 1400 mm,
milling, drilling, slotting, toothing system: front, straight, sloping, grinding and other.

Company´s business activities are connected with the most dominant partners : ZSSK Cargo and ZSSK Slovakia- the most important providers of railway services. This is the most significant business acitivity which depends on company´s strategy. Commercial acitivities also expands into foreign markets- EU -countries, it means that ŽOS Zvolen, a.s. produces components and welded structures for producers of railway vehicles and also others. Other important partners are Škoda Vagónka Ostrava, ZOS Zvolen, Rocla OYJ, GW Train Regio, US Steel Košice. Strategical target of the company is to expand business acitivities to the Eastern Europe and also other areas, and thus offer the wide range of production to the new potential markets.

LOKO division

LOKO operation place is the core unit of ŽOS Zvolen that provides modernisations, revisions, maintenance and repairs of diesel and electric rail vehicles, production and repairs of spare parts needed for the RV operation and the related business activities. It also produces components for rail vehicles and machine components and sets for other clients from Slovakia and abroad.

Trained professionals with many years of experience gained in the field of maintenance, repairs, reconstructions and modernisations of rail vehicles, aggregate repairs and reconstructions, production and re-passing of spare parts and machine components work in LOKO operation place.

LOKO division performs the following activities:

Repairs of rail vehicles and their aggregates

Repairs of engine powered locomotives with diesel-electric transmission of power,
Repairs of electric locomotives,
Repairs of engine powered carriages and railway cars,
Repairs of the following rail vehicle aggregates:
Repairs of combustion engines (CE), types: ŠKODA (ČKD), LIAZ, CATERPILLAR, MAN,
Repairs of traction engines (TE), types: TM 004, 005, 015, 006, 028, AL 4542 FIR, AD4636 gT,
Repairs of injection, water and oil pumps,
Repairs of axle gearboxes,
Repairs of dual wheels and undercarriages,
Repairs of turboblowers,
Repairs of electric installations and functional tests,
Repairs of measuring devices,
Repairs of various types of electric rotary machines,

Modernisation of rail vehicles

engine powered locomotives 736, 712, 711, 724, 744, 756, 746, 757, 773, 774,
engine powered carriages and railway cars 812, 813-913, 012,
tramways
electric locomotives type: 263 (refurbishment: PUSH-PULL)

Technologies used in LOKO

pressing of wheelsets, axles and tires (pressing force: MPa/398t),
machining of wheelsets- mean from 300 to 1250 mm,
drilling of engine constructions ( depth of drilling up to 1600 mm),
repairs of diesel engines
- ČKD- drilling: 170, 230, 310 mm,
- LIAZ- drilling: 130 mm,
repairs of heads of diesel engines with SERDI technology (machining and grinding of velves, heads),
grinding of crankshaft ( max. length: 5 000 mm, weight: 5 t),
drilling and honing of cylinders, max. range: 37- 313 mm,
repairs and testing of electric rotary machines:
- unidirectional max: 1 200 kW
- alternating max: 530 kVA
repairs of accumulator batteries typed: NiCd: typy KPH 80, KPH 150, KPH 360,
repairs of speedometers: registered and unregistered: HASLER and METRA with electric and mechanic drive,
repairs of injection pumps: all types/ PV, PC/produced by Motorpal Jihlava,
balancing of crank shafts and cardan shafts, rotors, pulleys and wheels
- max. operating speed/ min. : 2080,
- balancing weight of component: 10 - 5 000 kg,
- max. mean of component: 2 200 mm
- max. lenght: 2 000 mm
coating: varnishing, blasting and drying of railway and non- railway vehicles, max. length: 25 m
production of electric instrument panels
production, projection, maintenance services, repairs, revisions and reconstructions of electric devices without limitation of voltage
- railway vehicles
- vehicles of electric railways
- production of cable harnesses

MP division

The machine production (MP) operation place provides production and renovation of spare parts for repairs and modernisation of rail vehicles in particular. The MP division produces about 60% external prudction, the other production is production added for LOKO division. These days MP production is expanding to foreign countries such as Finland, France, Suise and other countries.

Machine equipment was modernised by adding machine tools and other machinery. Investments in new technologies enabled the use of highly specialised technological procedures, including crankshaft welding, renovations of combustion engine cylinder heads, fine working of rail vehicle dual axles, production of gearing, grooving, etc, moreover this process is still continuing. Machine equipment is still expanding thanks to new technologies such as pressbrakes, plasma cutting machine. These days the MP division starts the process of aluminum welding. The production is oriented to machining but also to machining of welded structures. As a result of investments in oversized horizontal machining cnc there is guaranteed the production of big details and also machining of welded structures.There is implemented ISO standard system for welding and machining, what guarantee high level of quality and value added.

The machine production currently focuses on the following:

Production of components and spare parts for rail vehicles,
Welding of steelworks for transportation and handling technologies,
Renovations of individual rail vehicle parts
Welding of thin-walled steelworks
Production of components by machining processes