Science project: Pulleys and Gears!

This person is mailing a package to his brother in the city.  He is standing on a gear that will make him push the mail cart down the rail towards the post office, where the package will get sent upwards on an elevator (building).

 

                                  

                                                         Full view of the project: 

This is the rail that leads to the elevator (building).

His brother is waiting at the door at the top of the elevator (building) for the package.

This helicopter is on the roof of the elevator (building).

Here is a video of the project in action https://youtu.be/thLOYoKG6L8