Train journeys in India were once defined by food, brought by passengers from their homes and purchased from vendors like this one. Passengers shared food with each other, exchanging stories and family histories, and sometimes striking new friendships that continued beyond the journey. But with growing availability of packaged food on trains, that culture is slowly dying. Dhiraj Singh/Bloomberg via Getty Images hide caption

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Dhiraj Singh/Bloomberg via Getty Images

Biryani is a popular South Asian dish made with rice and meat, fish or vegetables. Though it is rarely made with beef, it has recently become the target of some Hindu activists in India who want to protect the holy cow. John S Lander/LightRocket via Getty Images hide caption

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John S Lander/LightRocket via Getty Images

Indian schoolchildren wait in line for food at a government primary school in Hyderabad, India. Consistent access to nutritious food and clean water is key to helping children thrive, researchers say. Noah Seelam/AFP/Getty Images hide caption

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Noah Seelam/AFP/Getty Images