Try taking the dart train,
well you could try getting on the rail depending on where you are coming from...in denton it's called the A-TRAIN.. AND it connects to dart near carrolton..if you are coming in off 75 a dart train station is right there off Parker rd...goes all the way to downtown and puts you right in front of the fairgrounds gate.. some 30 ft away..you can park your car at the station for free and take the train...i suggest doing some research for train fare prices and connecting trains.. (DCTA AND DART) IS WHAT you are looking for.
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