Train operator c2c has cancelled 26 services between south Essex and London due to forecasted severe weather, as the Met Office predict highs of 34C in what will be a fourth heatwave of the year. High temperatures can damage rail infrastructure, causing tracks to overheat, overhead lines to sag, and potentially spark lineside fires. These risks mean trains must run at reduced speeds, forcing cancellations across the network. The full list of cancelled c2c services is as follows:2.27pm Shoeburyness to London Fenchurch Street2.49pm London Fenchurch Street to Shoeburyness3.36pm Thorpe Bay to London Fenchurch Street3.41pm London Fenchurch Street to Pitsea3.52pm London Fenchurch Street to Grays4.14pm Shoeburyness to London Fenchurch Street4.32pm London Fenchurch Street to Shoeburyness4.37pm Grays to London Fenchurch Street4.48pm Pitsea to London Fenchurch Street4.57pm Shoeburyness to London Fenchurch Street5.04pm Shoeburyness to London Fenchurch Street5.04pm London Fenchurch Street to Shoeburyness5.10pm London Fenchurch Street to Grays5.19pm London Fenchurch Street to Shoeburyness5.22pm London Fenchurch Street to Pitsea5.25pm London Fenchurch Street to Grays5.52pm London Fenchurch Street to Pitsea6.03pm Grays to London Fenchurch Street6.10pm London Fenchurch Street to Grays6.16pm London Fenchurch Street to Shoeburyness6.17pm Grays to London Fenchurch Street6.28pm Pitsea to London Fenchurch Street6.51pm London Fenchurch Street to Grays6.59pm Pitsea to London Fenchurch Street7.11pm London Fenchurch Street to Shoeburyness8.11pm London Fenchurch Street to ShoeburynessPassengers are advised to check live travel updates, allow extra time for journeys, and use alternative services where possible. c2c is also urging travellers to carry water to avoid dehydration.