There are trains that get you somewhere, and there are trains that are the somewhere. This journey is built entirely from the second kind. Over 14 nights, this expedition strings together three railways, two countries, and more than a century of railway history — from a UNESCO World Heritage narrow-gauge line clawing its way up into the Himalayas, through the tram-lined streets of colonial Kolkata, to the sleeper trains and river ports of the Bengal delta. It's a route almost