Just came across a new and informative video on Williams Trains. It tells the full story of Williams, starting from its founding in 1971, but focusing on the changes since Williams was acquired by Bachmann.
The video is currently the most recent upload on Toy Train Tips and Tricks, which resides on the big video platform. (I'm not sure if we're supposed to post links, but you shouldn't have any difficulty finding it.)
Highly recommended!