Railway passengers told to stay off trains when heat soars  BBCUK’s biggest train operator warns against travel tomorrow as temperatures climb  BBCRail passengers told to travel only if essential amid red extreme heat warning  The GuardianUK heatwave latest: Do not travel warnings issued as heatwave sends Britain into meltdown  The TelegraphUK heatwave latest: Rail firms warn against train travel as extreme heat prompts first hosepipe ban of summer  The Independent