The four, including two women, were seated in S-8 and S-9 coaches, which are non-AC, and other passengers claimed that they died due to excessive heat.
Images from across Europe and parts of Asia show hot and bothered people dunking their feet in buckets of ice and wading into the sea as sweltering temperatures put some areas on red alert.
Of that figure, a whopping 4,246 people died in Andhra Pradesh and Telangana alone.
Japan is being scorched by an intense heatwave that has prompted fears of similar extreme weather when the sporting showpiece takes place in the country.
With climate change impacts worsening and affecting the poor and most vulnerable, governments urgently need to scale up adaptation
Light to moderate rainfall in various parts of the country, including Delhi, on Tuesday brought respite from the scorching sun but heat wave claimed 16 more lives in Andhra Pradesh and three in Odisha, raising the nationwide toll to 2,357.
Top moments from around the world in the week that was.