So they’re travelling in a TARDIS coach which is longer on the inside?
 
@Pulse Wave  

@TwilightUCrazy  

 
Make that married to another mare (Daisy).

I just noticed that on the outside of the train, it looks like the train is slowing down to a stop.

Rainbow Dash? Walking? She rarely walks!

@Dogman15
 
You should ask them on Twitter about it.

I wonder how exactly this was achieved. Was it all in Flash or was a second 3D modeling/animation program employed?

@Background Pony #9996
 
Couldn’t have said that better. Great to see that folks appreciate their hard work!

AJ and Dash walking in a straight line, stationary in frame. Dash’s head swapping orientations mid-shot. And then all the layers of the moving floor, the seats, the train background, and the landscape all moving in parallax, AND all the other ponies moving along with it while individually animated, AND the rotation transformations on the seats while moving holy balls this is a complicated shot. This shot must have taken so long to put together and even longer to actually make work smoothly. This animation team deserve a medal.
 
And now I can’t help wondering how many times Flash derped this shot during recording.

This is just a really cool effect. A tip of the hat to the animators.

@bigladiesman  
No, that’s saved for when someone doesn’t ships shipping Lyre/Bon Bon.

@CMC Scootaloo  
It’s quite relieving if I’m wrong, then. I was expecting some serious drama over this harmless image.

@bigladiesman
 
Dramatic. But won’t happen.  
She can talk with other ponies here and there, unless Lyra is a jealous, demanding beast who doesn’t even allow her to have friends, because she’s afraid they could take her away from her.  
No problem here.

@Background Pony #6673  
Why, of course, this is the most logical explanation, but THIS. IS. DERPIBORUUUUUUUUUUUU! Where ships sail and sink every day, hour and minute. And they come loaded…  
Better grab some popcorn… And two bottles of Bourbon. I tend to like Four Roses best.

@TwilightUCrazy  
That’s what he tells Bon Bon to throw her off his trysts with Lyra.

@bigladiesman
 
What, you’ve never struck up a conversation with a stranger on public transportation?

@bigladiesman
 
Protip: It’s her brother… who is also gay.

@bigladiesman  
Grabs popcorn I’m ready.

Bon Bon with a STALLION? I see a bad drama rising, I see trouble on the way…