intense rainfall flooding roads, rail embankments slipping away, track buckling in the heat. it all adds up to disruption, including for train passengers. it is network rail s job to monitor the thousands of miles of railway track up and down the country for anything that could make it unsafe for trains to run. so every system that you are looking at is affected in some way by the weather. you will see the signalling equipment, we need to make sure that we maintain temperatures. we need to maintain power lines, because if the wires sag, they catch on the pantograph on top of the train. when the rails get too hot, the metal can warp. they are engineered to cope with britain s normal temperature range. last yea r s heatwaves tested the network s resilience. we are spending more money than ever before, but of course every year we see extremes of weather. we break records on heat, on rain, on wind, so we are really