Click on icon to view animation (window media player).
Click on link to download model.
All models are in 3D Studio MAX format and all include maps.

• Left click on the move tool then right click on it to get the Transform Type-in dialog box. 

• And move objects as follow by typing in Absolute world area: 

	X	Y	Z			X	Y	Z
CYLINDER	0	0	0		DUMMY02	-150	-10	0
DUMMY01	-40	-10	0		BOX	-150	-10	0

• Select Link Info, in the Inherit roll-out uncheck all axis for the rotate option that way the dummy will follow the rotation but don't rotate. Playback in the view port & you’ll see so. 

• Now select Dummy02 & link it to Dummy01 & on the Hierarchy panel/Link Info/Inherit roll-out uncheck the Y & Z axis for the Move option: Playback in the view port you’ll see that dummy02 follows dummy01 only in X axis. 

• Select Box01 & link it to dummy02, go to the Motion panel  in the Assign Controller roll-out Select Transform: Position… then click on the Assign Controler Icon and in the dialog box select. 

• Look At controller

• Click on Pick Target, pick Dummy01 & check flip. Now if you playback the Animation Viola! You have the train mechanism without IK.  

• Now you can add a cylinder & place it in the same location as dummy02 & link it to dummy02.

Actually this technique is better than IK because every time you want to increase the cylinder cycle rotation you just do so without solving IK again.

• In the front view port add another box and Link it to Dummy01 & make a copy of the Cylinder, & in the top view port move the Last Box just infront of the first box. Play the animation.