I’m not trying to post an obligatory image. This is a recast to the only Matchbox TV series there ever was. Even some of the voices did this show like Cathy Weseluck, Sam Vincent, and Ian Corlett.  
Applejack as Pounder (Pound Hound) Hard Workers  
Pinkie Pie as Rig (AKA Rig Digger) Jokers  
Fluttershy as Lt. Squaks (AKA Squakie-Talkie) Timid  
Rainbow Dash as Bumper (AKA J.R. Bumper) They love awesome things  
Twilight Sparkle as Buzz (AKA Dragonfly Helicopter) Intelligent  
Rarity as Rocky Hauler (AKA Rhino Dump Truck) They both hate being dirty  
Princess Celestia as Chief Hothead (AKA Hothead) Leadership  
Princess Luna as Speedy (AKA Snail Truck) They both miss out on stuff  
I even posted a TV tropes on this show. http://tvtropes.org/pmwiki/pmwiki.php/WesternAnimation/MatchboxHeroCity
 
You can watch the whole series with the link above the description, Enjoy! 44ever.