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Occasionally the toy won't like being fed from anything but a battery or SUPER clean power source, but most work on a wall wart or on track with a bridge rectifier or diode. Things with sound triggers seem to have the most issues.

E.g. My enigines passing close will trigger some.

Capacitors act to smooth an ac to dc conversation by BR or diode, closer to the constant output of a battery.

Mind voltage, leds especially don't like over voltage. Knocking voltage down, add a gen. purp. rect. diode inline(series), they eat .5 to.75v each. 

Three AAA or AA in series might give you 5v when new (1.7v-1.8v each simetimes) Maybe a bit too risky for for 4.5v volt items. I'd add a diode or run cheap dry cell batteries (no wet chemical leaks either )

When you aren't sure what voltage is safe, start low and stop once things work, 1.5v, 3v, 4.5, 6,9,12v will be the normal limits for the most common leds. Esp. common is 1.5v-4.5v.

And don't assume voltage, measure it.

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