Michael, we get to posts as soon as we are able, please do not repeatedly stack posts in such a short interval asking the same question.
If you have already opened the fridge, then you have obviously already played the shooting gallery game (receiving the witch doll) and so have already greased the mechanism which opens the shutter. Nothing more needs to be done in this area.
Did the ghost train move around on the track without Nicole? If so, then you need to do this:
Go back to the first car of the train. Look close at car underbody. See the drive wheel over the rail. Right click to learn that these wheels transfer the energy from the rail to the engine. Go to storeroom's workbench. Insert the plastic tile taken from the shooting gallery in the vise clamp. Turn the prop to hold the plastic tile steady. Use the nail on the plastic tile to make a hole. Turn the prop to open the vise.
Take and look close at plastic tile with hole. Use the string on plastic tile with hole to get a plastic tile with string.
Go back to train and look close at the underbody of the first car. Use the plastic with string on drive wheels.
"If you have already opened the fridge, then you have obviously already played the shooting gallery game (receiving the witch doll) and so have already greased the mechanism which opens the shutter. Nothing more needs to be done in this area."
Wrong No I haven't played the shooting game and no I don't have a "witch doll" but yes I opened the fridge so you are incorrect.
If you read my post above you would see that I wrote that I haven't oiled the top square of the shooting gallery yet. I also wrote that nothing yet (so far) lets me get up there to accomplish this yet