Impossible Engineering - Season 4: Extreme Railroads

Since their spectacular rise in the 19th century, railroads have been at the cutting edge of engineering and technology and that remains true, even today. Extreme Railroads shines a light on the world's most extraordinary rail systems, including New York's Arthur Kill Vertical Lift Bridge, Japan's Bullet Train and California's Central Pacific Railroad.

• S4 E1 - Deadliest Trains

• S4 E2 - World's Fastest Trains

• S4 E3 - Mega City Trains

• S4 E4 - Trains of the Abyss

• S4 E5 - Monster Mountain Trains

• S4 E6 - Trains of Deadly Seas