<p>Rear rail-mode "castors" between the 2nd and 3rd axles of Unimog tanker Reg Q982 HFR, rail number 99709 979013-8
</p><p>This design relies upon the rubber road tyres gripping the rails directly in rail mode, so the rail wheels are all unpowered, being for guidance only.<br></p>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/30661871@N03">Richard Ash</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/30661871@N03/32291949032/">IMG_8555</a>