General:

• 1st Series - 1921 or 1922 1 gauge bodies, couplers
• 2nd Series - 1922 - 1925 early truck without journals
• 3rd Series - 1926 until end of production, some freight cars continued with the original IVES bodies right up until 1930 and would be found with snake pull couplers starting in 1928. Others changed over to American Flyer and/or Lionel bodies starting in 1928 and would be considered Transition cars.