Go to "e-bay" (Google or Yahoo Search will get you there). Type in Lionel, you will see 12,000+ items come up.
The number on the side of the locomotive cab is the "catalog number". Same goes for the numbers on your cars. Now, you can find out what your units are really selling for. Upper left corner, after the word Lionel, one space, then type the number you are looking up (one number search at a time). Value is always based on Rarity and Condition.
Don U. TCA 73-5735
I'll echo what Tim said. The numbers on the side of the locomotive and all the cars is necessary to identify and estimate value. Color can also make a difference. I know one example of a gondola in its common black color is worth $5, but a rarer yellow version is worth well over $100.
And condition is everything. Two weeks ago, I saw a large lot of Lionel and AF trains priced at $250, including several desirable pieces. Lots of lookers, no takers. Last week, I saw a diesel locomotive, the same model that had been in that lot, in much better condition. It was priced at $300 and there were a couple of people falling all over themselves to get it.
For this reason it's hard to give a firm value of a train without seeing it in person--a scratch decreases the value, and while the camera magnifies some flaws, it tends to hide others--but at least it's possible to give a general idea.
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