So I've reached the cart and spent about an hour trying to figure out what to do from there. I finally came here and read someone was able to click on the cart and added it to their inventory. I went back through the switches and got to the cart. I've clicked, shot at, tried to push, anything to the cart. It does not budge and does not add into my inventory. Help please as I'm really frustrated and want to complete the game. Been very challenging!