Network Rail is preparing for widespread rail disruption as thunderstorms sweep across parts of the UK.
Rail tracks are expected to flood after drought hardened the surrounding ground, rail bosses said, which prevents heavy rain from soaking into the soil.
Therefore, when heavy rainfall hits, water could run off the parched ground and overflow the railway tracks, therefore disrupting services.
The warning comes a week after a train carrying 150 passengers derailed in extreme heat near Lewes, East Sussex, leaving 30 people injured.
The Met Office issued thunderstorm warnings on Thursday for parts of the UK over the coming days and into the following week,
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