To most of Ponyville, Rainbow Dash is a single child.

To Rainbow Dash, she's the youngest of a set of fraternal twins. Her twin is one she'd rather forget, but when she shows up in Ponyville, it could get messy. How will Rainbow react to seeing a relative she'd sooner deny all existence for than claim to be related?

Cover Image done by the awesome CaineScroll on DeviantArt. He's awesome.

A creature of old has been present in Equestria since the beginning of the rule of the alicorns, watching, waiting. He saw their fall and the sisters' rise to power. Now, for the first time in eons, he steps from watching and takes action.

Octavia dyes her marefriend's mane.

Things don't always go as planned. In the future, you can look back and see what went wrong. Retrospect, that's what it's called. Now, Spike sees the horror that has befallen Equestria, and writes to anypony willing to take up friendship again.

Applejack and Rainbow Dash knew this would be hard, but a long distance relationship was in their future from the start. A Wonderbolt and an apple farmer don't have a lot of time in the same place, so they do their best with letters and the occasional weekends. But when Applejack finds out that Rainbow Dash is on the cover of Flyers Illustrated: Wet Feathers Edition, it plays on a fear she never mentioned to Dash: Everypony knows that famous ponies are different from normal folks. . .

Right?

"Wet Mane Rainbow Dash," used in the cover image, is by Suikuzu.
Prereading by DbzOrDie, First_Down, Tchernobog, and Jackie

The Equestrian Industrial Revolution is in full swing. Rainbow Dash returns to a drastically changed Ponyville and to Twilight Sparkle, her last friend in the city. She must rekindle the bonds of love and friendship before the winds of change render the Elements of Harmony irrelevant. Even in a world of steel, fire and glass, loyalty is needed more than ever.

She was once a great mare, the pride of Equestria's rulers.
The sole wielder of the element of magic...
Now but a shell of her former self after just one tragic night... and the long months that followed.

Because what would it be like to have your closest friend violently taken away from you?
Even after a full year with no sign of him, would it ever seem possible that he would ever be seen again, or that he was even alive?

Twilight Sparkle, with the help of her friends, attempts to rebuild her life from the ground up after a full year of dwelling in the past, and trying to find any trace of her former assistant.
Spike's gone, but does Twilight have what it takes to bring herself back from the same void?

Octavia and Vinyl Scratch couldn't be happier together, but the cellist's friends can't seem to see why. When Octavia has an important meeting, will the mare that's stolen her heart seal the deal for better, or for worse?

When an accident reveals a disturbing truth, Scootaloo gets the news that she will never fly. Her newly found mentor and sister fill-in, Rainbow Dash, must confront a reality where both the hero and a dreamer are broken.

Seasons one and two are now complete! Season three is being continued in The AppleDash Project: Wherever Life Takes Us.

The AppleDash project is a series of short fics attached to various episodes, detailing a relationship between Rainbow Dash and Applejack behind the scenes. The stories take place sometime during or shortly after the indicated episode.

This is not meant to start shipping wars, argue that AppleDash is canon, or offend other shippers. In fact, if you like the idea I encourage you to try it with other ships!

Teen rating means that there may be talking about sex, and there is one line of dialogue that takes place during intimate relations, but it's warned for and skippable. Nothing sexual is described.