Activator Track

[trim forge]

Feels like its probably been suggested. This could be its own track, or a variant for every track. If a minecart with an object inside passes over it, it'll reset or toggle its state! This could be useful in making puzzles that require the player to hit objects in a single run, as well as creating a different kind of timer.

[delicate beacon]

ohhhhhh

[feral cipher]

I suppose dragging an object onto that track would "attune" that piece of track to what the minecart should have as it travels over that piece of activator track?