The reason for my detour was because I'd spotted there was a heritage railway nearby so I decided to take a look. As I was pottering around this engine turned up and it was the one I eventually took a trip on.  It's an ex BR diesel that apparently ended up in the hands of the National Coal Board.  I'd hoped for a steam train really but I didn't have time to hang around for an hour for the next train to turn up so diesel hauled it was!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/54741099@N00">Andrew Bowden</a> from London, United Kingdon
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bods/5086554150/">Engine at the Embsay and Bolton Abbey Railway</a>