It is the original power supply that came with the Christmas Street Car set.  I purchased it new almost 10 years ago.

My On30 Christmas Streetcar only works intermittently.  When it isn't working, there is no power coming from the plug-in adapter.  I have checked this with a multimeter.  The current adapter is has a 7.5 volt output, but I haven't been able to find one on your website.   Where can I get a replacement to plug in to the station house?  Hoping our Christmas village trolly will be moving soon.  Thanks.