(Kuala Lumpur, 2nd) The independent railway assessment body appointed to evaluate the Kuala Lumpur International Airport (KLIA) shuttle train (Aerotrain) system has confirmed that the overall system operation aligns with its original design expectations. Service interruptions since its launch are considered common issues for complex rail systems during the initial operational phase.
The assessment pointed out that, with systematic engineering control measures and continuous monitoring mechanisms in place, these problems do not pose a safety hazard and can be effectively managed through rigorous engineering management and maintenance protocols.
Since the launch of the Comprehensive Action Plan (CAP) on November 15, 2025, the shuttle train has maintained stable operations. Data shows that the operational service availability in December 2025 reached 100%, higher than the 98.67% in July 2025, indicating that the system has sustained high availability even while concurrent inspection, testing, and verification processes were underway.
The independent assessment report highlighted two key systems that have a direct impact on train reliability, service availability, and fault recovery capability, namely the power supply system and the rolling stock. For the power supply system, the overall design and protection mechanisms are deemed adequate and generally operate as expected, but there is a continued need to strengthen installation quality, power rail status monitoring, and clarity in operational responsibilities to further enhance long-term reliability.
As for the rolling stock, the assessment paid special attention to the current collector device, which interacts closely with the power supply rail and is crucial for traction continuity and service stability.
CAP is being implemented through multiple coordinated work streams covering inspection and repair, system testing and verification, as well as trial runs. Currently, inspection and repair work of the entire shuttle train system has been completed, and the plan is entering its final stage to address remaining repair items discovered during systematic checks.
For key systems, including the communication system, Supervisory Control and Data Acquisition System (SCADA), and the power system, focused testing has been conducted post-repair to verify their performance. At the same time, from December 16 to 24, 2025, the relevant units conducted trial runs covering 18 predefined test cases involving power supply, vehicle and signal interfaces, and the fire alarm system, among others. The findings have been fully documented, and targeted improvement measures are being progressively implemented.
During the CAP period, the scheduled engineering work time was from 9 PM to 7 AM the following morning. Later, to accommodate festive seasons and peak periods during school holidays, it was adjusted to 11 PM to 7 AM. With improvements in workflow and resource deployment, the shortened engineering period has been maintained, and CAP-related work is still progressing.
Malaysia Airports Holdings Berhad stated that, with ongoing monitoring and independent oversight, it will implement the remaining CAP measures in a coordinated and measured manner to further strengthen system reliability and ensure the continued stable operation of the KLIA shuttle train service.