Season 4: Extreme Railroads

The world's toughest trains have conquered deadly jungles, deserts, and mountains, and were made possible by expert engineering and cutting-edge technology.

The world's fastest trains were built with expert engineering and cutting-edge technology, pushing the speed of railroad travel to new limits.

The world's busiest cities are kept running by innovative train systems built with expert engineering and cutting-edge technology.

The world's most incredible trains cross deadly canyons and chasms of terrifying heights, and were made possible by expert engineering and cutting-edge technology.

The world's toughest trains have conquered the deadly heights of our tallest mountains, and were made possible by cutting-edge railroads engineered to make impossible climbs and brave extreme weather.

The world's most incredible trains have conquered dangerous oceans and seas, and were made possible by expert engineering and cutting-edge technology.