Budapest–Belgrade railway ETCS issues limit freight on Hungary link

Budapest–Belgrade railway ETCS issues are shaping the early operation of the modernized Hungarian section.

Freight traffic began on February 27 between Budapest-Ferencváros and Kelebia at the Serbian border, as reported by Railway Supply. The double-track upgrade covers about 160 km. It was built for speeds up to 160 km/h.

Budapest–Belgrade railway ETCS issues: what’s restricting operations

Hungarian media report that the physical works are complete. That includes the line, stations, and electrification. Still, the train control system compliant with the European ETCS standard is not yet operational. It has reportedly not received all required authorizations, according to RailwayPro.

Until the signalling is fully in service, operations remain tightly constrained. Only one train can currently run in each direction across the entire 160 km section. The next train can depart only after the previous one reaches the border. At the same time, speed is affected. Without the system active, the maximum speed would be limited to 100 km/h. In reduced visibility, it could be as low as 40 km/h.

ETCS-only line and MÁV fleet limits

A further operational constraint comes from how the route has been equipped. The modernized Budapest–Belgrade railway (Hungary section) has been fitted exclusively with ETCS. There is no alternative national system.

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That leaves the line open only to locomotives and trains with an on-board ETCS system. In the MÁV fleet, only certain types of rolling stock have this equipment. In addition, flexibility is reduced. This is especially true when diesel trains or shunting locomotives are needed.

Cross-border freight hurdles and passenger timing

International freight faces additional complications beyond the train control system not being operational. Serbia accepts a maximum train length of 700 m. By comparison, a 750 m European standard is referenced. This reduces the economic efficiency of international trains. Separately, Hungarian reports note that technical compatibility between the ETCS systems in Hungary (EU standard) and Serbia (Chinese-origin system) has not yet been fully clarified.

Electric locomotives cannot currently cross the border. Diesel locomotives are required. In practice, that means additional locomotive changes at the frontier. Passenger services, initially planned for the beginning of March, may also be delayed until the European ETCS standard system is completed and certified, as outlined by RailTech.

A strategically important corridor and investment scale

The Budapest–Belgrade line is part of the corridor linking Central Europe to the port of Piraeus in Greece. It was largely financed by a loan from China’s export-import bank. The Hungarian section is approximately 166 km long. It involved an estimated investment of around 1,000 billion forints (approximately 2.5–2.7 billion EUR). The project is mainly financed by the same lender.

Public data indicate the cost per kilometer on the Hungarian side is significantly higher than on the Serbian section. The difference is attributed to technical and regulatory requirements in an EU member state. That includes implementation of the European ETCS standard. Serbia’s section was inaugurated earlier. Still, completing the full modernized connection is considered a key project for regional freight and passenger traffic.

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