The Lionel 3376 Giraffe Car is by far the most popular car run on the layout. People of all ages love them especially when I run all 5 cars in row and operate them where the can duck through a tunnel, mountain and another tunnel. When I saw one operate at a train show I had some and accumulated 5 to date.
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Picture below: I made the triggers, along the rails, from some junk slats from old wooden shutter. I had to slide the black metal section further out on the yellow plastic trigger, to allow more space between the rail and the trigger so the valve gear of my Lionel 2025 and 2035 engines miss the trigger. You can see the wear on the trigger from the valve gear.
Lets See those Giraffe cars.
Charlie