Keep them running indefinitely by following these simple instructions
 
The operation of toy electric trains depends primarily on a transformer that steps down the 115-volt AC line to voltages not exceeding about 15. These are perfectly harmless. The transformer voltage is usually adjustable by means of a lever that moves against a series of contacts. It is important to keep the latter clean. Occasionally rub the contact surfaces lightly with a piece of fine sandpaper, tighten all connections, and inspect the flexible cord that goes from transformer to wall outlet. Electric clocks rarely stop because they burn out. In most cases the trouble is due to settling or lumping of the lubricant inside. Before throwing a stopped clock away, turn it upside down and leave it in that position for several days. In all likelihood the lubricant will re-distribute itself, and the clock will run for ten years.

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