but I was able to run a train this week!
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Congratulations, being able to run a train for the 1st time of a layout is a milestone, because it is a powerful incentive to make further progress.
One thing is not clear to me: the way I understand it you painted the cork roadbed, right ?. Why, because that paint will be covered by the paint you'll use when airbrushing the rails and ties ( roof brown for example ).
Jacques