I just re-discovered a long lost train set that belonged to my grandfather.  I don't have much knowledge or experience with model trains but I did a little research and the best I can tell it's a pre-war 225E engine w/tender.  There was only one piece of track in the container and no transformer.  I would like to test it out and eventually put it around my Christmas tree if I can get it to work.  Can anyone recommend a transformer, track type, and other accessories I would need to give this thing a try?

Thanks.