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Jan 7, 2026

Deep Freeze Disrupts Swiss Rail Network as Temperatures Plunge to –28 °C

Deep Freeze Disrupts Swiss Rail Network as Temperatures Plunge to –28 °C
Switzerland started the week gripped by an Arctic air mass that sent the mercury down to –28 °C in the Jura valley village of La Brévine and well below –10 °C in most major cities. While Alpine resorts welcomed fresh snow, the extreme cold crippled parts of the national rail system. Swiss Federal Railways (SBB) reported scores of switch-heater failures overnight, forcing speed restrictions, unscheduled platform changes and, in some corridors, outright cancellations.

Morning commuters between Winterthur and Zurich, Lenzburg and Lucerne, and on the Basel–Bern axis found regional trains running at irregular intervals. Long-distance InterCity services were less affected, but residual delays rippled through the timetable for much of the day. SBB said up to 7 % of its 7,500 switch heaters malfunctioned when ice accumulated faster than the electric elements could melt it. Field technicians were redeployed from planned maintenance to emergency de-icing, while operations controllers used dynamic re-routing to keep freight paths open for supply-chain critical cargo.

Deep Freeze Disrupts Swiss Rail Network as Temperatures Plunge to –28 °C


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The disruption has raised fresh questions about climate resilience. Switzerland’s rail infrastructure is famed for punctuality, yet MeteoSwiss data show a growing number of "ice days" when temperatures remain below freezing around the clock. SBB confirmed it is piloting smart sensors that trigger targeted heating only where needed, potentially halving energy use while keeping points operational. Business-travel managers are advised to monitor realtime alerts and book meetings with larger connection buffers for the rest of the week, as forecasters expect sub-zero highs until at least Friday.

From a mobility-policy perspective, the incident underscores how weather extremes can offset gains made by timetable optimisation and cross-border integration. Companies with time-sensitive shipments or commuter-heavy workforces should revisit continuity plans, including remote-work triggers and modal back-ups such as long-distance coach services. Travellers holding non-flex rail tickets can apply for refunds or rebookings under SBB’s passenger-rights scheme when delays exceed 60 minutes.
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