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Reply to ""Universal" Motors: AC Vs. DC"

VA means volts times amps.    A power pack rated at 25 VA means 2.5 amps at 10 volts, or any combination of numbers that multiply to 25.    That means if the loco is drawing 5 amps (highly  unlikely), then the max voltage the power pack will put out is 5.    Conversly if the loco draws 1 amp, the power pack theortically could  support 25 volts but probably has circuitry to limit it to about 12.   

The amperage draw from any loco/item is what determines the required power pack/breaker rating.    The heathkit at 1.5 amps is a pretty lightweight power pack.   It probably will work pretty well with a lot of more modern locos with more efficient motors but not so well with older stuff, espically multiple units.

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