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This site is probably your best bet http://homepage.ntlworld.com/russelliott/3rd-4th.html
Also http://www.semgonline.com/home.html ; it has pretty much everything on the Southern Region third-rail operations, from the start to the present day; and some of the rolling stock pages have close-ups...
About quarter of the way down this page are some pictures and information http://www.igg.org.uk/gansg/00-app3-4/ap3-emu.htm
Plus two of the bogies survived into the 1990s, according to wikipedia
In 1988 Strood and Higham tunnels flooded, and the 3rd rail shorted. So in place of the usual EPB consists, along came 4TC trailer stock a class 33; a class 117 DMU and a 207 thumper DEMU to run shuttles between Gravesend and Rochester.
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