You could add some kind of sound chip to your tractor and give your vehicles engine sounds or horns. Instead of just flashing an LED for a beacon you could make a more realistic motor driven rotating light.
Those scales also bring you into the realm of some smaller industrial hydraulics and pneumatics which means that you can make much more realistic movements with vastly increased power.
The below video shows some very good examples of what is possible when you have enough space, time and patience.
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