UP Business car lights operated by 'touch'.
Usually, a decoder or a magnetic wand is needed to perform this operation.
Now we can just touch a part of the roof to enable/disable lights; very cool.
I believe this is the first HO model that has incorporated this technique.
video:
https://www.youtube.com/watch?v=SmzUFYLJgcI
I 'googled' this method:
Touch-sensitive lamps use your body's capacitance to detect touch and toggle the light on or off, by effectively adding to the lamp's electrical storage capacity and triggering a circuit that detects this change.
Touch-sensitive lamps replace the traditional on/off switch with an electronic circuit that detects sudden changes in voltage or capacitance