![Rail passengers look at departures boards as they wait to board trains at Euston Station in London on Sunday. AFP](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/XM2FEMU7BHEUHZXMSPKROJNG2U.jpg?smart=true&auth=d9749fbee3256ac174a6b185403100374e7bcf75f78359c43e8eaf0fc33529d2&width=400&height=225)
Rail passengers look at departures boards as they wait to board trains at Euston Station in London on Sunday. AFP
Rail passengers look at departures boards as they wait to board trains at Euston Station in London on Sunday. AFP
UK heatwave: passengers urged to avoid rail travel during extreme weather
Twenty-one train operators have issued the warning as speed restrictions are set to delay travel