Being tugged over tot he maintenance centre at MAD.  This was in the mid-1980's.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/130275500@N02">G B_NZ</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/130275500@N02/29752658915/">Iberia 727-200 EC-CBC at MAD</a>