Postwar Lionel O Gauge 3435 operating Aquarium Car in original display panel box.  Someone has written "ST" in a corner of roof at one time and it has been wiped off, looks like crayon or grease pencil.  Train otherwise looks C8 with some very light run time on wheels.  Box has all flaps fully intact.  Push In Tab is intact at present.  Display panel is missing.  Box is clean, square and solid.  Box is a nice candidate for some restoration.