Do they take credit cards?

Yes

The Dutch Wagon is split up into different shops all under one roof. If you are visiting the deli or the smoked meats then you can use a credit card. If you are trying to buy something in the bakery, the pretzel shop or the candy shop, I believe it is cash only. But they do have an ATM located inside as well. There is also a small diner in there and a downstairs that sells handmade items and I assume they take credit cards but I've never shopped in those two places so I can't be certain.