I'm selling an MRC Model 501 ThrottlePack HO Transformer.  This transformer is in very good condition with the original box and paperwork.  The copper case has been oxidized but has been cleaned and looks good.  It has been tested and all terminals test with the correct output.  The box is in excellent condition.  I'm a TCA and LCCA member, see the pics.  See our other trains and collectibles at our eBay store, Joestoysntrains.