Save all of the people on the train and complete the other levels until you get to the level where he recreates his machine. To complete this level you must destroy all of the power generators. To do this, follow the cord that is streaked with orange (or yellow) and black. You will then get to the generators. Just kick them to destroy them. His shield will then go away and you must take out all of his legs. However, be careful. Then to defeat him, keep punching and kicking away.