(29 May 2013, 6:25 pm)aureolin wrote The line forks out just after the Viaduct. One part goes along the river to South Hylton, the other forking over the A182 and alongside the Lambton Estate, before heading off down Leamside.
Some good photos of the leamside line in the below link:
http://www.flickr.com/search/?q=leamside%20line