The LNER Encyclopedia

Although this was titled light railway it seems to be more of a tram route can anyone fill in some more details of its history. I saw it in a link about Newcastle Trolley buses which also features a few shots of Mr Gresleys products including at the end a shot of Silver Fox on the Silver Jubilee.
http://www.youtube.com/watch?v=UHfZN1BUeQk

also some film of the quayside electrics at the bottom end of the tunnels ,part no 3/6