I have a chance to buy a Lionel Train Set that I was told was from the 50's . It is not Mint , but very good . There is an Engine 1120 and 4 Cars ( 1002 , 1001T , 1007 , and 1005 . The Engine and Cars all have individual Boxes which are a little beat-up ( some broken flaps , etc. ) , but everything on the Boxes is readable. The tracks are well used and there is a Transformer , but no overall big Box. What would be a good buy Price ? TIA !