Follow Path Animation in Game Engine (blender 2.5)

I have a problem with Blender 2.5 and the The Engine.
I have an Object which moves from A to B in an Animation. But I did not do it with the standard location key frames, I did it with the constraint follow path. The animation works, but now I need this animation in the game engine. I know how I have to do it with normal key frames, but I need it with the constraint follow path. Because it is a train which travels from A to B.
Would be nice if someone could help me or has some ideas.

Animation Paths only work for the Render/Animation Engine, if i remember correctly.