Every year Mattel releases a new year of Hot Wheels. This complete set would be the Mainline or there Main Lineup. A mainline is a 1/64 scale Hot Wheel that is a new casting or reissue of an old casting same color as last years release, also this would include an old casting with new colors or Tampo for that year. Hot Wheels cars that are available at retail stores. This would include First editions and all sub sets.Sub sets feature various themes that vary from one year to another. These are your Main Lineup or Mainline.
A set of cars is released every year, always bringing new models that debuts under the First Editions series. Since 1990 the mainline has had collector numbers on the card.
Examples that would NOT be included in the Main lineup, Hot wheels playsets that include a car that is only found in that set. Special release, Red line club, 100% hot wheels, Non 1/64 models, Convention cars, Toy fair cars,