Here is what I have for you to enjoy. Also, the sky ride, train, Rhine River Cruise, Catapult, Log Flume, and Kinder Karussell are the only rides currently in operation since 1975. (Verified from Tram operators and Rhine River Cruise operators- both have been mechanically upgraded but are still the same tram-boats).
My park Transportation album is here with some cool vintage finds showing the double-Decker buses: https://www.facebook.com/media/set/?set=a.161588613994659.37688.149401725213348&type=3
The best photo I have is from a post card that I own. Yeah- I actually have this post card and no- you cannot buy it from me. Sorry guys and gals.