I got a picture of 3 cats enjoying the train-shaped cat toy my son-in-law (Marty) built for us. Grace had been IN the tunnel before I went to retrieve the camera... oh well.
Marty said he didn't intend for it to be shaped like a train, but it worked out that way, and the cats LOVE it. (Queen is on top and Bogie is on the engine and Grace is underneath.)