PKP IC Reduces Train Speeds After Wheel Set Defect: Safety Update

Poland’s state-owned rail operator PKP Intercity has imposed speed restrictions on 189 of its trains following the discovery of a critical defect in wheel sets, disrupting long-distance travel schedules and raising safety concerns across the country’s high-speed network.

Defect Identified in Wheel Sets

The decision to limit train speeds was announced on April 27, 2026, after a dangerous incident involving a PKP Intercity train revealed structural flaws in the wheel sets—critical components that connect the wheels to the axle. The defect, described in reports as a form of tread damage, has been linked to potential risks of excessive vibration, increased wear on rail infrastructure, and, in severe cases, derailment. While no accidents have been reported as a direct result of the flaw, the operator acted preemptively to mitigate safety risks.

According to Kolejowy Portal, the affected trains include a mix of high-speed Pendolino units and conventional long-distance rolling stock. The speed restrictions vary by route but generally reduce maximum operating speeds by 20% to 30%, extending travel times on key corridors such as Warsaw–Kraków, Warsaw–Gdańsk, and Warsaw–Wrocław. PKP Intercity has not disclosed the exact number of wheel sets affected but confirmed that the issue spans multiple train models and age groups.

Operational and Financial Impact

The speed limits are expected to cause widespread delays, particularly on Poland’s busiest routes, where high-speed trains typically operate at 200 km/h (124 mph). Industry analysts estimate that the restrictions could add 30 to 60 minutes to journey times on affected services, potentially leading to passenger dissatisfaction and financial losses for the operator. PKP Intercity, which reported a net profit of 120 million złoty (approximately €27 million) in 2025, has not yet provided an estimate of the financial impact but acknowledged that the restrictions would strain its operational capacity during the peak summer travel season.

The company has also faced criticism from passenger advocacy groups, who argue that the defect reflects broader underinvestment in rail infrastructure. In a statement cited by Interia Wydarzenia, PKP Intercity attributed the issue to “manufacturing irregularities” in a batch of wheel sets supplied by an unnamed European manufacturer. The operator has launched an internal investigation and is coordinating with the Office of Rail Transport (UTK), Poland’s rail safety regulator, to determine the root cause of the defect.

Safety Protocols and Industry Response

PKP Intercity has implemented a series of corrective measures, including accelerated inspections of all wheel sets in its fleet and the temporary withdrawal of certain trains for reprofiling—a process that involves machining the wheel tread to restore its original profile. The operator has also increased the frequency of trackside monitoring using wheel impact load detectors, which measure dynamic forces between the wheel and rail to identify potential defects before they escalate.

The incident has drawn attention to the broader challenge of maintaining rail safety amid aging infrastructure and increasing demand for high-speed services. Poland’s rail network has undergone significant modernization in recent years, including the introduction of Alstom’s Coradia Max trains under a 2025 contract with PKP Intercity. However, experts warn that the rapid expansion of high-speed rail places additional stress on rolling stock, particularly wheel sets, which are subjected to higher loads and wear rates at elevated speeds.

In a 2023 study published in Railway Engineering Science, researchers found that severe wheel tread damage can generate impact loads exceeding 300 kN—nearly three times the normal operating force—leading to accelerated fatigue in bearings and rail components. The study, which analyzed field tests at varying speeds, concluded that such defects pose a “significant risk to the durability of wheelsets and track infrastructure,” particularly in high-speed applications. While the study did not name specific operators or manufacturers, its findings align with the concerns now facing PKP Intercity.

Regulatory and Passenger Reactions

The Office of Rail Transport (UTK) has ordered PKP Intercity to submit a detailed report on the defect and its corrective actions by May 10, 2026. The regulator has also indicated that it may impose additional oversight measures if the investigation reveals systemic failures in maintenance or procurement practices. In a statement, UTK emphasized that “safety remains the highest priority,” and that it would “take all necessary steps to ensure the integrity of Poland’s rail network.”

Passenger reactions have been mixed, with some travelers expressing frustration over the delays while others have praised PKP Intercity for its proactive approach. On social media, several passengers reported receiving notifications about schedule changes via the PKP Intercity mobile app, though some criticized the lack of clarity regarding the duration of the restrictions. The operator has advised passengers to check real-time updates before traveling and has waived fees for ticket exchanges on affected routes.

Broader Implications for Poland’s Rail Sector

The incident comes at a critical time for Poland’s rail industry, which has seen a surge in ridership following the expansion of high-speed services and government subsidies for rail travel. PKP Intercity carried over 50 million passengers in 2025, a record high, and has invested heavily in fleet modernization to meet growing demand. However, the current defect raises questions about the long-term sustainability of these investments, particularly as the operator prepares to integrate new rolling stock under its 2025 contract with Alstom.

Industry observers note that wheel set defects are not uncommon in rail operations, particularly in networks with high-speed services. However, the scale of the current issue—affecting nearly 200 trains—suggests a potential systemic flaw in either manufacturing or maintenance protocols. Similar incidents have occurred in other European countries, including Germany and France, where wheel defects have led to temporary speed restrictions and costly fleet-wide inspections.

For PKP Intercity, the immediate priority is restoring full service while ensuring passenger safety. The operator has not provided a timeline for lifting the speed restrictions but indicated that We see working “around the clock” to address the defect. In the longer term, the incident may prompt a review of procurement standards and maintenance practices, as well as increased collaboration with manufacturers to prevent similar issues in the future.

As Poland’s rail network continues to evolve, the current crisis underscores the delicate balance between expansion and safety—a challenge that operators across Europe are grappling with as they seek to modernize aging infrastructure while meeting the demands of a growing passenger base.