Middleton Railway - under the M621. This preserved industrial railway passes in a tunnel under the motorway. The railway dates back to 1812 and was the first commercially successful steam railway using a rack rail system due to concerns regarding adhesion. This was on a gala day celebrating 150 years of the Hunslet Engine Company.
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/4264">Chris Allen</a>
CC BY-SA 2.0
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/4579510">geograph.org.uk</a>