Prototypes are computer-generated versions of the engines which have been used in place for official images and on checklists. There are few differences between some of the prototypes and the final produced versions.
Troublesome Truck as Scarecrow
Warrior Percy from 50 MINIS!
Warrior James from 50 MINIS!
Warrior Diesel from 50 MINIS!
Warrior Millie from 50 MINIS!
Holiday James from Advent Calendar
Holiday Henry from Advent Calendar
Holiday Toby from Advent Calendar
Holiday Diesel from Advent Calendar
Holiday Ben from Advent Calendar
Animated Racing James from Motorized Raceway
Glow in the Dark Percy from Glow in the Dark
Glow in the Dark James from Glow in the Dark
Glow in the Dark Paxton from Glow in the Dark
Glow in the Dark Charlie from Glow in the Dark
Insect Porter from 30 pack
Insect Troublesome Truck from 30 pack
Slime Bertie from 30 pack
Slime Stanley from 30 pack
Slime Victor from 30 pack
Ferdinand as Martian Manhunter
Diesel 10 as Solomon Grundy
Creature Troublesome Truck
Percy as Patrick from SpongeBob SquarePants 4-Pack
Bash as Mermaid Man from SpongeBob SquarePants 4-Pack
Emily as Pearl from SpongeBob SquarePants 4-Pack
Spencer as Gary from SpongeBob SquarePants 9-Pack
Skarloey as Mr. Krabs from SpongeBob SquarePants 9-Pack
Rosie as Mrs. Puff from SpongeBob SquarePants 9-Pack
Porter as Barnacle Boy from SpongeBob SquarePants 9-Pack
Millie as Sandy from SpongeBob SquarePants 9-Pack
Gordon as Squidward from SpongeBob SquarePants 9-Pack
Diesel 10 as Plankton from from SpongeBob SquarePants 9-Pack
James from Motorized Raceway
Second Metallic James prototype
Second Racing Thomas prototype
Second Robot Toby prototype
DC Super Friends 4-pack mock-up box