to raise the most money, take them to an O scale show, but that involves travel time and costs and is not much fun if you arae not interested in the show anyway.
Another choice would be list them on on "O Scale Yard Sale" groups list which is mostly 2 rail. Or just put them up on Ebay as "O Scale Brass".
The OGR for sale forum is a possibility too, but since it is mostly 3 rail stuff, 2-railers don't visit it as often.
A hudson in decent shape should draw 500 or more I would think. I have not idea about the other one, but it is a newer model based on brand, so might not be as much as the hudson because of popularity, but close because a newer, more detailed model.
