Rug in playroom?

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We're moving and will use one of the rooms downstairs as a playroom and I'm debating whether we should have a rug in there or not. It's a brand new wood floor. The pro is that a rug is nice to sit and play on, but the con is that our oldest play a lot with his train set and I'm thinking it's not very easy to play with that on a rug, also a rug makes it a bit more of a hassle to clean. What do you think?

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