Computer Power Adapters for train layouts

[Anonymous]

I've come across a couple AC 70W computer power adapters that put out 24 volts and 3.5A’s. I'm thinking of using them to power accessories on my layout: lights in buildings, coal tower, crane, etc…. My concern is that the voltage is too high and may end up frying everything. Any suggestions or thoughts?

[lionelsoni]

As long as you use 24-volt lamps, there should be no problem with the lights in the buildings. You can also use a suitable dropping resistor in series for an accessory that is a constant load when on, like a crossing gate or semaphore; but you'll be wasting about half the power in the resistor.

Seventy watts at 24 volts is slightly less than 3 amperes.