Well, for $38, Azatrax has the solution ready made - D2T-2W for LGB 2 wire switch motors
Resurrecting this old thread with an update!
I purchased two of these units last fall to make my Ross Std gauge switches non-derailing. Finally had a chance to install one unit last night and I'm very pleased. The installation instructions are thorough and clear. The unit functions very well - can't wait to install the other one to make my reversing loops completely automated.
It's nice to use a product that functions as advertised and that makes running trains easier/more fun.