The power of autonomous underground trains. Tube line 14 in Paris, in operation since 1997 <noscript><iframe title="The power of autonomous underground trains. Tube line 14 in Paris, in operation since 1997" width="1080" height="608" src="https://www.youtube.com/embed/GQpmd1GBrU8?feature=oembed" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></noscript>
