This is a list of the Hi-Jinks you must perform in the Triple Decker Tank Engine level. It contains the title, number of times you have to perform it, and a description. If you're having trouble finding a specific doll, refer to this level's doll location guide:
The Warm Embrace (5) Hug female dolls with Gilliam [the Furry].
Hallowed Sheets (5) Cover [child] dolls with sheets.
Clocked Out (5) Knock down dolls with the punch clock ability.
Soup for the Sick (1) Serve soup to any infected doll.
Tickle Gas (1) [Feather] dust Meriwether Malodor.
Clownaclysm (5) Use the [Peck the Clown's] Scream on child dolls.
Belly Bumper (5) Belly Bump child dolls.
The Artful Dodger (4) Escape from the guards without being caught. [Completely unstack, and restack into a small doll before the guard gets to you.]
Evil Stack (1) Stack any three evil industrialists together.
Masked Missus (5) Disguise female dolls with [Corporate Spy].
Please let me know in the comments if there's anything you're stuck on so I can improve this guide.