In pictures: Children discover Delhi's wonders

Prabha (centre, front) is from the southern state of Tamil Nadu.

"This is the first time I've travelled by train. It was a long journey, it took us 36 hours to get here, but I enjoyed it a lot. It's an opportunity of a lifetime," she said.

Her village school has four rooms and she likes going to school. "My teacher is good, she never scolds me."