@Nation Wide Lines posted:The contact pictured on the left is a pickup to power the lights in the car only and contacts only with the center rail and the contact pictured on the right is a pickup for the 4 rail whistle track.
Not sure as to your confusion, because the lighter shade set should not have a whistle, unless it is a set that is repainted in the wrong color.
I don't see 4 rail whistle track on your layout so I cannot see how you would be able to blow the whistle on your set.
The 4th rail of the American Flyer 4 rail whistle track would have a separate power supply to it and a button to provide power to blow the whistle.
NWL
Be careful when sourcing 4-rail track as they also marketed 3-rail with the same fiber backing during that time period.