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The higher the VA rating the more power you have at higher voltages. VA means Voltas * Amps. Since most power cupplies for G scale will output 20-28 volts then to have 10 amps you need 200-280 VA to run at the highest voltage with the highest current. There are power supplies for G scale out there with up to 600VA (25 amps at 24 volts). Also the better the filtering the better off you are. Filtering reduces AC power in the DC line (often referred to as noise). This AC can ruin sound systems, puts undue stress on motors and can harm other components of your layout. Filtering cost money so the better filtering is usually found in more expensive power supplies. Also, run 10-12 gauge wire to your track. The shorter the distance to the track the better. This will minimize voltage rop in the wire and lost power. And, keeping your track clean is also helpful.
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