The happiest mules on earth set out on another journey through the treacherous (but beautiful) Rainbow Desert. The little girl waves happily to her parents while younger brother (in front of her) concentrates on the business at hand. If ya gotta ride a mule, this is the place to do it! In the background you can see the dark-green Mine Train cars filling up with brave passengers. By 1960 they would be painted yellow as part of the revamped "Mine Train Through Nature's Wonderland". But you already knew that, didn't you?