London Underground, a system of rail lines, is still growing through the present day with the latest line expected to carry an incredible 30,000 people per hour in each direction.

Subscribe to Spark for more amazing science, tech and engineering videos - https://goo.gl/LIrlur

Follow us on Facebook:   / sparkdocs  

Follow us on Instagram: https://www.instagram.com/spark_chann...

Content licensed from Kew Media to Little Dot Studios. Any queries, please contact us at: [email protected]

#TheTube #LondonUnderground #spark #sparkdocumentary #sciencedocumentary