SZ ZGP Ljubljana

Railway Infrastructure Constructionsz-zgp.si

SZ ZGP Ljubljana is a Slovenian public joint-stock railway construction company that builds, modernizes and maintains rail and tram infrastructure, including track, bridges, contact networks and signalling, primarily for the Slovenian state and increasingly for international clients in Croatia.

Company typePrivate
Founded1947
HeadquartersLjubljana, Slovenia
Headcount101–250
GTM typeB2B
OfferingServices

What SZ ZGP Ljubljana does

SŽ - Železniško gradbeno podjetje Ljubljana d.d. (SZ ZGP Ljubljana) is a Slovenian public joint-stock company founded in 1947 and headquartered in Ljubljana, specializing in the construction, modernization and maintenance of railway and tram infrastructure. It is described in its own corporate materials as the only firm in Slovenia qualified to execute the upper structure of railway lines, and has historically served as the main contractor on most construction projects across the Slovenian rail network, including the Ljubljana-Brezovica, Zidani Most-Celje, Poljčane-Slovenska Bistrica and Maribor station upgrades.

The company's service portfolio covers the full rail-infrastructure value chain: lower and upper track structure, overhead contact networks, signalling and telecommunications systems, bridge reconstruction, industrial sidings and noise barriers. Execution relies on a proprietary fleet of specialized machinery, including UNIMAT 08-4x4/4S universal tamping and levelling machines, turnout and track tamping/levelling machines, gravel seeding and profiling machines, the Robel 40.61 SILAD long-rail transport train (nine four-axle wagons, 178.2 m total length, capable of handling rails up to 120 m), portal cranes for track-panel replacement, and hydraulic rail insertion devices. Since 2021 the company has also fully owned Kamnolom Verd d.o.o., a quarry operation supplying ballast and aggregates, providing vertical integration into raw materials.

SZ ZGP Ljubljana generates revenue almost entirely through project-based, competitively tendered contracts, primarily with the Slovenian state via Direkcija Republike Slovenije za infrastrukturo (DRSI) and Slovenian Railways (SŽ). Contract values disclosed in project materials range from mid-single-digit millions to EUR 45.8 million total project value (with ŽGP's upper-structure portion at EUR 17.7 million on Ljubljana-Brezovica). International expansion is under way, evidenced by a EUR 20 million contract at the Port of Rijeka (85% EU-funded) and tram-line works in Zagreb. The company is publicly listed on the Ljubljana Stock Exchange (ticker SZLG), maintains ISO 9001, ISO 14001, ISO 3834 and ISO 50001 certifications, and employs between 101 and 250 people.

SZ ZGP Ljubljana firmographics

Firmographics

Name: SZ ZGP Ljubljana
Legal name: SŽ - Železniško gradbeno podjetje Ljubljana d.d.
Website: https://sz-zgp.si
Company type: Private
Founded year: 1947
Operating status: Operating
Headcount range: 101–250 employees
Short description: SZ ZGP Ljubljana is a Slovenian public joint-stock railway construction company that builds, modernizes and maintains rail and tram infrastructure, including track, bridges, contact networks and signalling, primarily for the Slovenian state and increasingly for international clients in Croatia.
Ownership category
akta.pro rank

SZ ZGP Ljubljana industry classification

Industry

Product category: Railway Infrastructure Construction
NAICS: Support Activities for Rail Transportation (4882), Highway, Street, and Bridge Construction (237310), Utility System Construction (2371), Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (8113)
SIC: Heavy Construction Other Than Bldg Const - Contractors (1600), Railroad Equipment (3743), Railroad Switching & Terminal Establishments (4013), Construction Machinery & Equip (3531)
akta.pro primary industry: Track Renewal, Rehabilitation & Maintenance Works (IMAFAFAI)
akta.pro secondary industries: Railway Track & Civil Works Construction (Ballast, Slab Track, Alignment) (IMAFAFAA), Track Infrastructure Management & Maintenance (Rails, Sleepers, Ballast, Turnouts) (TLAJADAA), Rail Electrification Systems Construction (OCS/OHL, Third Rail) (IMAFAFAB), Rail Maintenance & Track Vehicles (Hi-Rail, Track Machines, Inspection Vehicles) (IMAHAIAK), Rail Terminal Repair-in-Place & Light Maintenance (Trackside/Terminal) (TLAJAFAK)

Keywords

Railway construction
Railway infrastructure
Track maintenance
Bridge construction
Civil engineering

Where SZ ZGP Ljubljana is headquartered

Location

Headquarters

HQ city: Ljubljana
HQ country: Slovenia
HQ region: Europe

Offices1 record

Markets served

SZ ZGP Ljubljana business model

Business model

GTM type: B2B
Offering type: Services
Cost components: Personnel, Operations, Supply Chain, Infrastructure

Revenue model

Railway Infrastructure Construction Services: Primary revenue stream from construction and renovation of railway infrastructure including new railway lines, track upgrades, and railway station modernization. Projects are typically awarded through competitive tendering with government clients. Revenue is project-based with contracts ranging from several million to tens of millions of euros.
Railway Infrastructure Maintenance: Ongoing maintenance services for railway infrastructure including track maintenance, repair of railway facilities, and infrastructure preservation. Provides recurring revenue from both public and private railway operators.
Railway Machinery Rental/Operation: Specialized railway construction machinery available for project execution, including tamping machines, levelling equipment, and track maintenance vehicles.

Pricing tiers

Model	Billing	Price
Other	Multi-year contract	Railway construction projects - custom pricing based on scope and specifications

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

SZ ZGP Ljubljana product offering

Product offering

Core offering

Construction and maintenance of railway infrastructure, including the upper structure of railway lines, contact networks, signaling and telecommunication devices. The company also performs bridge construction and repair work.

Product overview

SZ ZGP Ljubljana (Železniško gradbeno podjetje Ljubljana d.d.) is a railway construction company offering specialized construction and maintenance services for railway infrastructure. The company's core service is the construction and maintenance of the lower and upper structure of railway lines, including contact networks, signalling and telecommunication devices. They operate specialized railway construction machinery and equipment for track laying, maintenance, and renovation projects. The company serves both public railway infrastructure (as the main contractor for Slovenian railway projects) and private railway operators. Their primary offerings include: new railway line construction, renovation and maintenance of existing railway infrastructure, industrial track construction, bridge construction and repair, and signalling system installation. The company does not offer software products or digital platforms.

Differentiator

Problem solved

Functional benefit

Products and services

Railway Line Construction Construction of railway lines, with particular focus on the upper structure of railway tracks for government and railway infrastructure clients.
Railway Infrastructure Maintenance Maintenance services for existing railway infrastructure, including tracks and associated systems.
Bridge Construction and Repair Construction and repair of bridges as part of railway infrastructure projects.
Contact Network Construction Construction of contact networks (overhead line systems) for railway electrification.
Signaling and Telecommunication Installation Installation of signaling and telecommunication devices for railway infrastructure.

Companies that use SZ ZGP Ljubljana

Customer profile

Named customers4 records

Segments3 records

Ideal customer profiles1 record

SZ ZGP Ljubljana technology and API

Technology

Technology focussed No

API detail

Has API: No
API docs
API detail

Core technology

AI maturity

App detail

Feature8 records

SZ ZGP Ljubljana partnerships and signals

Strategic signal

Scale indicators3 records

Recent moves9 records

Expansion highlights5 records

SZ ZGP Ljubljana competitors and assessment

Company assessment

Direct peers

Leonhard Weiss: German family-owned construction company with substantial rail infrastructure operations including track construction, overhead line, and civil works. Comparable as a privately-held, multi-generational European rail contractor with similar end-customer profile of public railway authorities.
Swietelsky: Austrian-based major European construction group with a dedicated railway construction division covering track, electrification, and signaling. Directly comparable as a Central European rail infrastructure contractor competing for similar EU-funded and government tenders across Slovenia and the Western Balkans.
SPITZKE SE: German railway construction specialist focused on track, switches, and overhead line systems with proprietary machinery fleet. Highly comparable to ŽGP given its in-house specialized equipment, government-railway client base, and concentrated geographic market footprint.
Rhomberg Sersa Rail Group: Specialist railway construction and maintenance contractor with strong presence in track renewal, slab track, and turnout works across Europe. Closely matches ŽGP's niche focus on upper-structure track construction, maintenance equipment, and turnout tamping capabilities.

Broad incumbents

Strabag: One of Europe's largest construction groups with a significant rail infrastructure division. Operates across the full lifecycle from civil works to track systems across CEE and Western Balkans, overlapping with ŽGP on major tenders but with vastly broader scope and balance sheet.
Colas Rail: European rail infrastructure subsidiary of the Bouygues Group, covering track, electrification, signaling, and catenary systems. Competes for the same EU-funded and government rail tenders as ŽGP across Central and Southeastern Europe with a much larger project portfolio.

Others

Plasser & Theurer: Austrian manufacturer of track maintenance machinery (tamping machines, ballast regulators, inspection vehicles) — the OEM behind equipment such as UNIMAT. Functions as an enabling supplier to ŽGP and the broader rail maintenance contractor ecosystem rather than a direct competitor.

Regional players

Tehnomont: Croatian industrial and railway contractor active in track work, electrical installations, and infrastructure projects across the Western Balkans. Comparable as a regional peer operating in the same adjacent market where ŽGP has demonstrated cross-border delivery (Rijeka, Zagreb).

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

SZ ZGP Ljubljana compliance and trust

Trust signal

Compliance4 records

SZ ZGP Ljubljana financial estimates

Financial estimate

Revenue estimate

Valuation estimate

SZ ZGP Ljubljana leadership team

Management profile

Number of profiles

SZ ZGP Ljubljana subsidiaries and ownership

Company hierarchy

Subsidiaries1 record

SZ ZGP Ljubljana funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

SZ ZGP Ljubljana M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SZ ZGP Ljubljana

What does SZ ZGP Ljubljana do?

Is SZ ZGP Ljubljana a public or private company?

SZ ZGP Ljubljana is a private company. It is classified as public and is currently operating.

When was SZ ZGP Ljubljana founded?

SZ ZGP Ljubljana was founded in 1947. It employs 101 to 250 people.

Where is SZ ZGP Ljubljana based?

SZ ZGP Ljubljana is headquartered in Ljubljana, Slovenia, in the Europe region.

How does SZ ZGP Ljubljana make money?

Three revenue lines are on record. Railway Infrastructure Construction Services are the primary driver. The others are railway Infrastructure Maintenance and railway Machinery Rental/Operation.

Who are SZ ZGP Ljubljana's main competitors?

Direct peers on record are Leonhard Weiss, Swietelsky, SPITZKE SE and Rhomberg Sersa Rail Group. Broad incumbents are Strabag and Colas Rail. Plasser & Theurer is listed as an others. Tehnomont is listed as a regional player.

Does SZ ZGP Ljubljana have an API?

No public API is recorded for SZ ZGP Ljubljana.

What industry is SZ ZGP Ljubljana in?

SZ ZGP Ljubljana's product category is Railway Infrastructure Construction. Its primary akta.pro industry code is IMAFAFAI, Track Renewal, Rehabilitation & Maintenance Works, with a secondary code of IMAFAFAA, Railway Track & Civil Works Construction (Ballast, Slab Track, Alignment). Its NAICS code is 4882 and its SIC code is 1600.