Campbell Scale Models Catalog No. 6 By n/a Books / Paperback Transportation › Railroads Publisher: National Model Railroad Association, Inc., January 1964 Price $25.04 Free Shipping Send to a friend Used - Very Good Very Good condition. Number 6. (model trains, parts, hobbies) $25.04 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.