My son loves Thomas the Train. He loved going to the train museum. It's an old warehouse that is stocked full of old train cars. You and your kids can go into the cars. They aren't just box cars. They are passenger cars, etc. They also have train sets that kids love to watch and railroad equipment, signs, etc. Retired engineers and railroad employees volunteer to work the museum. These folks are full of stories and knowledge. Be sure to ask questions. The only downside is the last time we were in there, they did not have air conditioning and there is no place to buy food or drinks.
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