Within the past few months there have been a couple of threads asking about the operation and repair of prewar whistle controllers, such as the #66.
Turns out that Lionel did publish material on these controllers. I happened across them yesterday, and thought I would provide links to those that were interested.
Thanks again to Olsens Toy Train Parts for making this material available online.
http://pictures.olsenstoy.com/searchcd31.htm?itm=1843
http://pictures.olsenstoy.com/searchcd31.htm?itm=1844
http://pictures.olsenstoy.com/searchcd31.htm?itm=1845