When Monisha Rajesh announced plans to circumnavigate the globe in 80 train journeys, she was met with wide-eyed disbelief. But it wasn't long before she was carefully plotting a route that would cover 45,000 miles - almost twice the circumference of the Earth - coasting along the world's most remarkable railways; from the cloud-skimming heights of Tibet's Qinghai railway to silk-sheeted splendour on the Venice Simplon-Orient-Express. Packing up her rucksack - and her fiance, Jem - Monisha embarks on an unforgettable seven-month-long adventure that will take her from London's St Pancras station to the vast expanses of Russia and Mongolia, North Korea, Canada, Kazakhstan, and beyond.