Nina investigates how cable cars work - with the help of Luke, her sight neuron. Engineers Kieron, Liam and Luis visit Nina in her workshop and discover that cable cars can help people get across rivers and up hills and mountains. Next they visit a cable car that goes across the river Thames, they see how a big strong cable moves all the cars along. Back at Nina's workshop they find out how the cable cars grip onto the cable when they want to move along and un-grip the cable when people want to get off. Show less