Lionel Transformer Type 1011X - 25W, 115V, 25 Cycles (Hz).  I am not a Lionel guy so I don't know anything about this transformer.  As a 25 Cycles transformer is it unusual, or collectible, or scarce?  I really don't know.  Also I have never seen a Lionel plug such as this one.  Note also that this has three side terminals unlike any other on ebay at the moment.   I don't know if it works - I didn't want to risk plugging it into a 60Hz wall outlet and watch it smoke.  Sorry no box.  Send me a message if you know something about this particular transformer.