Inside a Northern line 1972 Mk1 tube stock Driving Motor looking towards the guard's area showing the panels from where the passenger doors were opened and closed.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47739225@N08">citytransportinfo</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/citytransportinfo/49219629863/">1972 Mkl DM inside guards panel</a>