Just a suggestion. The collecting of civil transport items, and studying old tram systems, is quite a popular hobby. So perhaps an email to one or more of the websites (such as the LRTA) would bring some more info.
http://www.lrta.org/index.html
http://home.wtal.de/bahnfreunde/
http://www.lightrail.de/
http://www.lrta.org/index.html
http://home.wtal.de/bahnfreunde/
http://www.lightrail.de/
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