Has anyone built a "swayback" structure ?

[MasonJar]

At long last, here is the swayback car I was thinking of... Turns out it is for sale. Follow the link to a description of how Modelsof1900 made it. <!-- l --><a class="postlink-local" href="http://bigbluetrains.com/forum/viewtopic.php?f=31&t=8932">viewtopic.php?f=31&t=8932</a><!-- l -->

Andrew