Being a passenger in this vast country is ‘a full-blooded immersion in the local’, says the novelist whose latest protagonist is lured by the romance of the railsI carry my train journeys in my bones, the juddering song of the Indian rail. Our first prime minister, Jawaharlal Nehru, famously likened India to a palimpsest, no layer quite effacing the one that went before. That’s how I think of Indian railway journeys. They inscribe on the mind our fellow travellers, our ways, our thousand languages, our landscapes, our climate.I think of a rail journey I made in 1998 – that brutal summer of nuclear testing – setting out from Mumbai, in an ordinary three-tier sleeper, for Dehradun, 1,000 miles (1,600km) north. The frazzled train fell off any semblance of a schedule. The voyage grew longer, past 50 hours; hotter, past 50C. I remember the metallic burn on the window grilles; the hot, killing wind that blew through them; the sizzle of water drops splashed on the face when theyhit the uncove...