The modernised railway between Belgrade and Budapest remains without a confirmed passenger-service date, despite the completion of the main construction works and the operation of Serbia’s domestic high-speed section. Final testing of the European Train Control System is continuing on the Hungarian side, where Chinese specialists are working to resolve software and safety issues.
Hungary’s Ministry of Construction and Transport has said that passenger traffic can begin only after all safety prerequisites have been met. The outstanding work concerns the integration and certification of train-control and signalling technology, rather than conventional track construction. The system must operate consistently across rolling stock, trackside equipment, control centres and the Serbian–Hungarian border interface.
This distinction explains why a visibly completed railway can remain closed to passengers. Modern high-speed infrastructure depends on software and signalling as much as rails, bridges and stations. A fault affecting train location, speed supervision or communication cannot be treated as a minor commissioning issue because it directly affects operational safety.
The Serbian part has been delivered in stages. The Belgrade–Novi Sad section opened in March 2022, while the line from Novi Sad to Subotica entered service in October 2025. Regular passenger operations between Belgrade and Subotica began on 8 October 2025, giving Serbia a functioning domestic corridor even while the cross-border connection remained incomplete.
The Serbian works were divided into the Belgrade Centre–Stara Pazova, Stara Pazova–Novi Sad and Novi Sad–Subotica–state border sections. Chinese contractors China Railway International and China Communications Construction Company handled two sections, financed predominantly through loans from China’s Export-Import Bank. RZD International delivered the middle section under Russian financing. Ministry reports place the value of the Serbian works at approximately $2.37 billion.
The remaining delay limits the return on that investment. Serbia already receives domestic benefits through faster travel between Belgrade, Novi Sad and Subotica, but the larger commercial case depends on through services to Budapest and onward connections into Central Europe. Without direct international trains, the corridor cannot fully compete with road and air travel for business passengers, tourists and regional journeys.
The opening timetable has moved repeatedly. Hungarian officials had previously referred to 20 February 2026, then to a period between late February and mid-March, and subsequently to Easter. None of those deadlines was met. Freight operations began on the modernised Hungarian section at the end of February, but passenger services require additional signalling harmonisation and safety certification.
A July statement suggested that passenger services might start within one or two months, but it was not accompanied by a firm date. That leaves operators, tourism companies and passengers unable to plan around a dependable launch schedule.
For Serbia, the delay is more than a transport inconvenience. A direct, reliable rail connection to Budapest would support tourism, corporate travel, university mobility and labour-market links. It would give northern Serbia and Vojvodina stronger access to Central European cities and provide an alternative to congested border crossings and short-haul flights.
The railway also carries political and financial significance. It is one of the most prominent Chinese-backed infrastructure projects in Central and Southeast Europe, involving Chinese finance, contractors and signalling technology. The commissioning difficulties show that physical construction is only one part of integrating a non-EU delivery model into European safety, certification and operational systems.
Delaying service until the signalling system meets all safety requirements is preferable to opening under political pressure. The problem is the absence of a stable, transparent commissioning timetable after several previously announced dates passed without passenger operations.
Serbia has already invested heavily and opened its domestic sections. The remaining value of the corridor now depends on completing software corrections, cross-border system harmonisation and Hungarian certification. Until those elements are closed, the route will remain a high-profile piece of infrastructure whose most important international function is still waiting to begin.
