This Moc is based on the ideabook 8888-1 page 4-5 Harbor crane with a additional crank. The reason for the crank is that the LEGO original design is flawed and most if not all 4.5V engines can't pull a so heavy load as this chain.
I personally recommend to use black 12V engines and hook it to your train transformer controlpanels, put down a som train tracks under it and let it be a part of your 12V train landscape.
I you intend to use 4.5V system note that the cables and batteryboxes is up to you. They are not included in the inventory. Use what you have instead of me saying that you should use a batteryrod or box of a certain color.