I have 2 Bachmann steam engines that I want to couple together.  One is the 150 0-6-0 steam engine that comes with the Chattanooga train set.  The other is the 0-6-0 steam engine 2126 of the tether.  Both are running at the same speed.  I cannot figure out how to the tether of either to hook to the front of either engine.  Is there a part I am missing to do this.  I notice that the c hook on the front of both engines are non moving but they look the same.  Any ideas.  Thanks.