How are trucks, and couplers attached?

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#1
I have been looking around the internet trying to find some pictures of the bottom of rail cars. I have found one halfway decent image of a boxcar on it's side, but the trucks are gone. Ok this one is usable, kind of, it was taken so far away no real detail is visible.
Here is what I am doing, I am making some railroad, buildings, cars bridges etc. using Google SketchUp. The amount of data available online is surprisingly limited. Anybody here have a link to the ultimate resource, for railroad stuff?
 



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