The Planet Trains land

This is where the Planet Trains land and our heroes meet them for the first time in Thomas and Twilight Sparkle vs. The Mummy.

[as everyone sets up camp the team notice Stuingtion's engines are looking in the sky, as if they are looking for something in the sky]

Thomas: What are they doing?

Spike: Beats me.

[the team head up to Stuingtion's engines]

James: What's up?

Hugs: What?

Applejack: Why in tarnation are y'all lookin' in the sky?

J.J.: We're waiting for someone.

Willy: [checks his watch] Where are they? They should've been here by now!

Cadance: Who's "They"?