Yee-Haw!! The Pony Rider Boys are on the move again! This time they are on their way to Bluewater, New Mexico, ready for whatever adventure they can find. But this time, trouble spots them on the train. Will the Pony Rider Boys be able to handle whatever comes their way? (Summary by Ann Boulais)

Previous book in the series: The Pony Rider Boys in the Alkali
Next book in the series: The Pony Rider Boys in the Grand Canyon