Rarity has expanded her business into Canterlot and even helped Rainbow Dash fly with the Wonderbolts. This may just be the greatest moment of her life.

And yet, on the train back to Ponyville, she can't help but think about what could still go wrong. Fortunately, one of her friends is here to listen to her worries... though Rainbow Dash seems to have her own concerns at the moment.

A condensed and refined version of an entry in the November 2015 Writeoff Competition. Prompt: Out of Time

Also, in case it needs to be said, the cover image does not accurately reflect the train in the story; it was just the most appropriate thing I could find on Derpibooru.