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One the line between Pelaw and Sunderland, the Metro system shares track with main-line train services. The Metro is currently the only example of this kind of light and heavy rail integration in the UK.
Image: Yi-Tao Lee 2010 (CC BY-NC)
http://www.flickr.com/photos/timojazz/4274685781
(Lytebox viewer by Markus F. Hay, 2006-2012 CC BY)