Candle Powered Cable Car
A candle burns under the short tower, and another on the platform of the tall tower.
When the first candle burns to a pre-set mark, the mechanism is activated, and the first candle is snuffed.
At which point the cable car rises to the top of the tall tower as a lift descends from there toward the lower platform.
When the lift hits the spring stop, a mechanism releases the snuffer which will extinguish the candle.