Things You'll Need
Instructions
Locate the train's model number. Generally, the model number will contain four digits, and it will be located on the bottom or right side of the Lionel train.
Locate the model number in an established train collector's guide, such as TM's Lionel Price &Rarity Guide (two volumes) and Greenberg's Pocket Price Guide to Lionel Trains. These guides are updated each year and contain thorough listings of all Lionel trains and sets. You should be able to match the model number (or name, if you have that) to the product in order to determine the year that the train or set was released.
Consult train collecting experts. If you are unable to determine the age of your item using the guides, then contact a train collecting organization such as the Train Collectors Association or the Lionel Collectors Club of America.