1.thank you for your reply!
I have have asked by noch about delivery time and they have told me, that the
item will be available qagain in the middle of july.
You can drive the locos with batteries or a power supply, which should be better
if you buy it in Japan.
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2.thank you for your mail!
You Need two power converters, because you have two circuits.
Please look here for the noch specifications:
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It is also possible to drive first with batteries.