Well, in my opinion, you never can have too much air.? Air compressors don't run constantly, only after the reservoirs drop below a set pressure. (I forgot what it is.)
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I would suggest two single phase air compressors as shown on my HO model below.? Prototypically, this would allow to pump up faster.
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Even small locomotives benefited from dual single air compressors.
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Rich G(ajnak)
