What caused trains to disappear from the Kelana Jaya LRT control screen?

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Trains Vanished from Monitoring Screen Due to Signalling System Issues

The disappearance of trains from the Kelana Jaya LRT operation and control centre's monitoring screen was the initial indicator of a problem with the signalling system. This inability to automatically track the trains necessitated the suspension of services for a week, beginning November 9th, to address the technical fault.
Loss of Visibility on Control Screens

Prasarana Malaysia CEO Mohd Azharuddin Mat Sah stated that the inability to see the trains on the operation and control centre's monitoring screens was a critical sign of the issue. This lack of visibility meant the trains could not operate automatically, highlighting a significant fault within the signalling system.
Immediate Suspension of Operations

The critical nature of the trains vanishing from the monitoring system led to the difficult decision to suspend operations along a stretch of the Kelana Jaya LRT line. This suspension affected 16 stations, from Kelana Jaya to Ampang Park, and was implemented for a full week, commencing November 9th, to ensure passenger safety and allow for thorough investigation.
Examination of Signalling System Components

Efforts to diagnose the intermittent loss of signalling involve the original equipment manufacturer, Thales Group, which will be examining test logs. Concurrently, Rapid Rail engineers have undertaken several troubleshooting steps, including implementing software updates, replacing modems, and swapping power supply components in an attempt to pinpoint the root cause of the problem.

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What caused trains to disappear from the Kelana Jaya LRT control screen?

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