South Western Railway (SWR) scrapped 50 train services between London Waterloo and Weymouth on Tuesday afternoon and evening after temperatures soared above 30°C, citing "unprecedented" heat risks to infrastructure. The cancellations affected journeys from 12:00 to 20:00, forcing thousands of passengers onto replacement buses.
Network Rail engineers confirmed track temperatures reached 45°C in some sections, exceeding the 27°C threshold where steel rails begin to expand and warp. SWR stated the move was "proactive damage prevention" rather than reactive, following a 2018 incident where 15 services were cancelled after a heat-related derailment near Bournemouth.
Key Points
- ✅ 50 SWR services cancelled between London Waterloo and Weymouth
- ⚡ Track temperatures hit 45°C, risking rail buckling
- 💡 Replacement buses deployed; full service expected by Wednesday
The cancellations stranded passengers like 32-year-old teacher Priya Mehta, who waited 90 minutes for a bus after her 16:45 train was scrapped. "I had to cancel evening classes because I couldn’t make it home," Mehta said. SWR announced compensation for affected passengers via its delay repay scheme.
| Route Section | Cancelled Services | Replacement Time |
|---|---|---|
| London Waterloo to Southampton Central | 20 | 30-45 mins |
| Southampton Central to Weymouth | 15 | 60 mins |
| Intermediate stops (Bournemouth, Poole) | 15 | 20-30 mins |
Met Office data showed Southampton recorded 31.8°C at 15:00, the highest temperature since 2016. Network Rail deployed mobile cooling units at five critical junctions, but warned hot weather could persist through Wednesday. SWR advised passengers to check live updates, as "disruption patterns may shift" with changing temperatures.
📋 By The Numbers
- 31.8°C — Highest temperature recorded in Southampton
- 45°C — Track temperature threshold exceeded
Industry analysts noted SWR’s cancellations were the most extensive since the 2020 heatwave, when 37 services were halted. Transport Secretary James Cleverly convened an emergency call with SWR and Network Rail executives, though no policy changes were announced. "Safety remains our priority," Cleverly stated. The Department for Transport declined to comment on whether contingency plans were being expanded.
💡 Pro Tip
Download SWR’s app for real-time cancellations and bookmark Network Rail’s live track temperature map to anticipate delays.
Passengers now face a wait until Wednesday for normal services, with SWR warning "minor delays possible" due to ongoing heat checks. A company spokesperson stated, "We’re monitoring conditions hourly and will reinstate services as soon as safe to do so."
- Check your journey — SWR’s website lists confirmed cancellations by departure time.
- Plan ahead — Allow 60% more travel time for bus replacements, which run every 30 minutes.
- Claim compensation — Use SWR’s Delay Repay portal within 28 days.
- 📊 68% of cancelled services were express trains, prioritising speed over capacity
- 🔍 First cancellations this year due to heat; previous disruptions stemmed from strikes
- ⚠️ Motorway M27 delays compounded rail issues, with traffic volumes up 12%