A major Telstra outage in Australia has disrupted train services across Victoria and New South Wales, highlighting the critical role of mobile networks in rail operations.The incident, which began around 4:30am, caused V/Line regional trains to suspend services entirely, with no estimated recovery time.Trains rely on mobile networks for real-time communication with control centres, sharing data like location, speed, and safety alerts.Without this connectivity, even if trains can technically operate, ensuring safety becomes impossible.The Australian Rail Track Corporation (ARTC) upgraded its rail communications to 4G on the Telstra network in 2024, making it vulnerable to outages.While satellite systems exist as backups, they lack the reliability of terrestrial networks.Telstra's acting CEO attributed the outage to timing issues in network nodes, with no evidence of malicious activity.

The incident underscores the growing reliance on mobile infrastructure for critical services, raising concerns about redundancy in regional areas where coverage is sparse.