LEGO Train-heads, yes, you’re probably beaming ear-to-ear with pride that you are well aware and know the use of this particular piece. For the rest of you who’s wondering, it’s not too late to extend this little mystery a little longer, take a guess on HOW exactly it’s used in train sets? Still pondering and wondering? Let’s cut to the chase, you’re here to get answers. Read right on to find out.