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4 Mainlines How Many PWR56's?

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ON28:
A DCC friend has 12 boosters on his 40x25 multideck layout, including one for each of six mainlines. He explained that he wanted each mainline to be completely independent within the system.

Tom:
"This question is not how many mainlines, but how many locomotives.  Each pwr-56 can support up to 4 amps (56 watts at 14vdc). Allow a 25% safety, let’s use 3 amps.   I base my layout on the estimate that most HO locos will not exceed .5 amps.  So you can run 6 locos on a single power supply.   Work it from there for your layout."

For the electrically challenged: how many locomotives can be run By a PWR-56 with two AR-1s and one AM-2S (only running 2 blinking crossing signals and the bell sound, for now) attached to the PWR-56?

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