I believe that this beautiful set is the No.5555W "The New Pacemaker Passenger". It comes with the No 326 4-6-4 Hudson with large motor, No.918 Operating Mail Pick-up car, (slight rust on mail pickup arm), No.953 Combine, No.952 Pullman Coach, No.954 Observation ( decal on rear platform in good complete shape). The set comes with a box of 12 curves, 6 straight track that are loose, the special mail pick-up stand, No.690 power track terminal hook-up in package, No.706 uncoupler in box, No.18-693 Track Locks in package, No.710 Whistle Control (no box). No transformer. Not sure if this set came with a transformer and original owner did not have one. Has the instruction booklet, smoke cartridge and inspection voucher. I would grade the set out to at least Ex+. It is in very nice condition. The engine has original wrapper, cars have all their boxes and it comes in set box. The set box has Bin # 595 9-28J. Made by Star Corrugated Box Company, Inc. It measures 20 1/2 inches long, 12 1/2 inches wide, 8 inches tall. I have been told that this is not the correct set box but this is the box that the original owner got the set in. Everything fits so I am not really sure. Who knows what they did at the Gilbert factory on any given day. The box for No.918 Mail Pick-up Car is stamped 55 B-1183. Made by Interstate Container Corp of New England. The passenger car boxes have some taped flaps. I was also told they should have numbers stamped on interior flaps. There are no numbers stamped on interior flaps. The outside end flaps are stamped with correct lettering and description for the cars. So once again I am not sure. I bought this set from original owner and I know he did not piece it together. So correct or not, this is how I am selling it. The condition of everything matches each other, which sort of tells me it came as a set. Thanks for looking and let me know if you have any questions. I would have posted more photo's but limited to twelve. Please also be aware that the white lines you see on red car roof edges are from the flash of the camera. The paint on cars is 100%. Thanks again.