Michael Portillo's railway journey across eastern Canada concludes in the nation's largest metropolis, Toronto. He begins his Toronto tour at Union Station. Now busier than the city's international airport, Michael is shown the ambitious engineering works underground to support the growing number of commuters.From the dig down, he boldly goes to the dizzying heights at the CN Tower for an extreme outdoor experience at the top of the structure. Nerves are calmed at the Royal York Hotel, one of a network of luxury hotels built by the railway known as the 'castles of the north'.Catching the street car, Michael finds out how Toronto made itself a magnet for money after it set up its own stock exchange, but not before he presses the button to open the day's trading.Ending his time in the city's High Park, he seeks out the origins of a celebrated Canadian song that helped to shape the maple leaf as the country's national symbol.