These things are absolutely HUGE. They're over 50 metres long and make a massive massive noise!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41216460@N00">Richard Riley</a> from Nottingham, England
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/rileyroxx/6168639645/">Road Train - Leonora</a>