Network Rail's New Measurement Trains (NMT) is  seen passing through Canton, Cardiff  with the 0642 Derby R.T.C.(Network Rail) to Landore T.M.D working on 29th August 2017. I believe the power cars were 43062 &amp; 43014.  Formed of a specially converted high speed train (HST) the NMT inspects the condition of the track across the UK rail network.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/126337928@N05">Jeremy Segrott</a> from Cardiff, Wales, UK
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/126337928@N05/36728640772/">New Measurement Train: Canton, Cardiff</a>